We have a few threads with lots of good information and discussion but I am going to put the "official" information here.

As it appears we are entertaining two offerings:

16795 - 2.5" Stainless Steel dual cat-back with Tru-X and Quad Tips. Finalized

XXXXX - 2.5" Stainless Steel dual cat-back with Tru-X and XXXX Tip(s) - In Development. Performance exhaust geared for subtle sound level changes over stock.

================================================== =========================================

Product: 16795 Stainless Steel Cat-back

Application: 2008 Pontiac G8 GT 6.0L V8

Description: 2.5" Stainless Steel Dual Exhuast with Tru-X and Quad Exit

Dyno:

Baseline: 313 HP / 333 lb-ft
Magnaflow 16795: 326 HP / 347 lb-ft

PEAK: + 13 HP / + 14 lb-ft
MAX: + 17 HP / + 18 lb-ft

http://www.magnaflow.com/richard/08PontiacG8GT/g8%20GT.JPG

Sound Level:

Stationary Tailpipe - SAE J1169 testing standards
--------------Stock---16795
Curb idle -------68------77
1500 rpm ------69------84
3000 rpm ------77------90
3/4 Peak HP ---80------94

Driving Interior
--------------Stock---16795
Acceleration
30-40 mph ----71------79
50-70 mph ----73------75

Cruising
40-50 mph ----70------71
60-70 mph ----72------72

Images:

Stock
http://www.magnaflow.com/richard/08PontiacG8GT/g8%20stock%20under.JPG

16795
http://www.magnaflow.com/richard/08PontiacG8GT/G8%2025inch.JPG

Tip Close up
http://www.magnaflow.com/richard/08PontiacG8GT/g8%20dual%20tips.JPG

Video / Sound Clip:

http://www.magnaflow.com/04sound/sportsound/08G8/08G8.html

When are you going to start shipping????

I love it :gears:

When do you expect them to start shipping? I'm curious as to how much weight has been saved over the stock setup.

Good lord look at the A/F ratio!!!! talk about pig rich! A catback/intake/tune should yield some pretty huge gains.

So the 2nd one is being engineered to be quieter?

Yeah, with Premium, I think it could run a 13.0 AFR.

So I'm ready to order......when can we expect them to be available for shipping?

Nice! whats the price going to end up being?

oxidizr-

Good info. What is the weight difference in between the stock and the Magnaflow?

Yummy.

I just felt something stir in my pants....:boink:

Yummy.

I just felt something stir in my pants....:boink:
Not again! :err:

how much how much

Very nice, this is the system I will be buying when I get my G8.

Any plans to develop a high flow catalytic converter section? I would think there's another 10 hp tied up in the stock cats.

Very nice, this is the system I will be buying when I get my G8.

Any plans to develop a high flow catalytic converter section? I would think there's another 10 hp tied up in the stock cats.

Very good point! I'd buy that as well if it was available.

So just for clarification, did the 3 inch setup really highlight the dod/afm? Did it sound too choppy?

So just for clarification, did the 3 inch setup really highlight the dod/afm? Did it sound too choppy?

I can answer that as I got to drive the car with both kits installed. With the "louder" 16795 2.5" kit you can hear it switch into 4 cyl mode and back, but you have to be listening for it and neither sounds terrible. With the 3" on an otherwise stock car there's considerable interior resonance and when it switches to 4cyl mode it's a pretty annoying sound and it causes quite a bit of vibrations.

The 2.5" kit totally rocks BTW. I'm loving it. :gears:

This Magnaflow cat back system is perfect! I think even if both were available I want the one with more sound.

16795 - 2.5" Stainless Steel dual cat-back with Tru-X and Quad Tips. Finalized


2 Questions:

Does anyone know a price?

What is the stock exhaust system's diameter? (2.25")?


...

I also like the system but would like it with more sound, would MegnaFlow consider a lower price on a group buy from members?

Very nice, this is the system I will be buying when I get my G8.

Any plans to develop a high flow catalytic converter section? I would think there's another 10 hp tied up in the stock cats.

I would like to know this as well, the Cats have to GO..

I wonder what sort of cats/manifold setup the GXP will have? I would be willing to bet it has a more free flowing design than the GT's.

This Magnaflow cat back system is perfect! I think even if both were available I want the one with more sound.

16795 - 2.5" Stainless Steel dual cat-back with Tru-X and Quad Tips. Finalized


2 Questions:

Does anyone know a price?

What is the stock exhaust system's diameter? (2.25")?


...

If I remember correctly, the stock exhaust is 2.25", though there is a section that goes down to 2" I believe. I think they mentioned the price being similar to the GTO exhaust, around $5-600.

If I remember correctly, the stock exhaust is 2.25", though there is a section that goes down to 2" I believe. I think they mentioned the price being similar to the GTO exhaust, around $5-600.


Sweet! Thanks for the answers. I'm looking forward to making the exhaust a little louder with no in car drone.

This Magnaflow catback is a sweet set up!

Anyone Hook Up A Group Purchase Deal Yet?
Im In
Kerley

Found the price for the Magnaflow cat back system. I want it bad, but it's a little over $1,000 K. Ouch. Here's the link..............


http://www.magnaflow.com/02product/shopdisplayproducts.asp


The link still requires you input: The Year, The Make, & The Model.
Easy enough.....




...

that's msrp (again, similar to the gto); if you search for other threads, you'll find resellers selling for 575 shipped at least..

Found the price for the Magnaflow cat back system. I want it bad, but it's a little over $1,000 K. Ouch. Here's the link..............


http://www.magnaflow.com/02product/shopdisplayproducts.asp


The link still requires you input: The Year, The Make, & The Model.
Easy enough.....




...

I think that sounds great. I like how it won't be too loud but enough to let you know you have a v8 under the hood. This car is way too quiet for sure.

-Brian

Found the price for the Magnaflow cat back system. I want it bad, but it's a little over $1,000 K. Ouch. Here's the link..............


http://www.magnaflow.com/02product/shopdisplayproducts.asp


The link still requires you input: The Year, The Make, & The Model.
Easy enough.....




...

LOL, says G8, but the pic is a Holden.

:)

Nice sound clips in that link. Add in a CAI and tune up the fuel and trans and watch out SRT's.:yumyum:

that's msrp (again, similar to the gto); if you search for other threads, you'll find resellers selling for 575 shipped at least..


Thanks for the info Bill, if you have any links post them. I'll have to do some searching. I didn't know about the cheaper prices....

Found it, if you read through you'll find the link, coupon code, etc...

http://www.g8board.com/forums/showthread.php?t=1812

Thanks for the info Bill, if you have any links post them. I'll have to do some searching. I didn't know about the cheaper prices....

Any idea how the "quieter" system might sound when combined with headers (based on other apps -- GTO, Vette, etc.)?

Found it, if you read through you'll find the link, coupon code, etc...

http://www.g8board.com/forums/showthread.php?t=1812


Thanks Bill. And this is for Drob8 too......

I know the market is just starting up - but there are vendors on the left that carry Magnaflow. Please do not post non-sponsor links.

will the 3 inch setup cause any back pressure issues on the top end?

I looked under the car at the stock exhaust system today to see how difficult it would be to remove the stocker and install this or another catback system. Seems straightforward, although I'm not sure I could do it myself (might need another set of hands to support the system). I think you just need to unbolt the 4 flanges, remove the center chassis brace and work all the hangers and that's it. Oxidizer - is that about right?

Thanks

It should be pretty easy to do. I'll remove the mufflers first and it'll be tempting to video tape the sound of the exhaust without mufflers. ;-)

Only tip I can offer is to spray some WD-40 on the metal hangers and rubber holes they go into, it makes it easier for them to pop off the hanger.

It should be pretty easy to do. I'll remove the mufflers first and it'll be tempting to video tape the sound of the exhaust without mufflers. ;-)

Only tip I can offer is to spray some WD-40 on the metal hangers and rubber holes they go into, it makes it easier for them to pop off the hanger.

I noticed when I changed the oil the bolt heads from the cat to the tubes are welded to the flanges, so you will at least need something like an electric grinder or a cut off tool. Other that than it seems pretty simple.

And also a note, I wouldn't use WD-40 on any rubber parts on my car. Petroleum products disintegrate rubber. Not for sure if the exhaust hangers are made of petroleum resistant rubber or not but just FYI. Probably be better off finding a water or silicone based lubricant..


..maybe KY or astroglide. :) JK

I noticed when I changed the oil the bolt heads from the cat to the tubes are welded to the flanges, so you will at least need something like an electric grinder or a cut off tool. Other that than it seems pretty simple.JK

Thanks for the tip - didn't realize those bolts were welded. That makes it an easy decision for me when I get a catback . . .muffler shop for $100!

Thanks again!

..maybe KY or astroglide. :) JK

I have a tube of KY in the glove box...never leave home without it! Ha!:boink:

will the 3 inch setup cause any back pressure issues on the top end?

3" System performed nearly identical to the 2.5". I have dynos if you would like to see them.

I looked under the car at the stock exhaust system today to see how difficult it would be to remove the stocker and install this or another catback system. Seems straightforward, although I'm not sure I could do it myself (might need another set of hands to support the system). I think you just need to unbolt the 4 flanges, remove the center chassis brace and work all the hangers and that's it. Oxidizer - is that about right?

Thanks

Sounds about right ... 4 flanges / 8 bolts for removal. The Magnaflow piece will be clamps and smaller segments which are much easier to install.

I noticed when I changed the oil the bolt heads from the cat to the tubes are welded to the flanges, so you will at least need something like an electric grinder or a cut off tool. Other that than it seems pretty simple.

And also a note, I wouldn't use WD-40 on any rubber parts on my car. Petroleum products disintegrate rubber. Not for sure if the exhaust hangers are made of petroleum resistant rubber or not but just FYI. Probably be better off finding a water or silicone based lubricant..


..maybe KY or astroglide. :) JK

No cutting required. Our system bolts up to the stock studs in the flanges.

Any idea how the "quieter" system might sound when combined with headers (based on other apps -- GTO, Vette, etc.)?

I am not sure even how the header world will deal with the DOD / AFM noise issue. I will definatley be working with some LT headers on this appliation and seeing how the car operates in V4 mode with V8 LT headers. I can say i have some concerns that DOD / AFM may need to be turned off for such applications as the tuned length for V8's might end up casuing some fueling issues while operating in V4 due to some exo-therm issues presented by the relocation of the front O2 sensor. We will see.

As far as how the system will sound with LT's ... I would expect normal operation would present similar results as seen on the GTO.

And also a note, I wouldn't use WD-40 on any rubber parts on my car. Petroleum products disintegrate rubber. Not for sure if the exhaust hangers are made of petroleum resistant rubber or not but just FYI. Probably be better off finding a water or silicone based lubricant..
That is correct. You shouldn't use any oil to remove the exhaust off of the rubber hangers.
A mild soap and water mixed in a spray bottle will work just fine.

3" System performed nearly identical to the 2.5". I have dynos if you would like to see them


That would be great if you can give any info u have on the 3 inch setup. Also, any possible sound clips??

Would be interested to hear from anyone that installed this kit themselves how difficult or easy it was? Does the Magnaflow kit use clamps or is welding required?

Would be interested to hear from anyone that installed this kit themselves how difficult or easy it was? Does the Magnaflow kit use clamps or is welding required?

Somewhere it was posted, just clamps.

Read back up the page. There is no welding only bolt on and clamps.

Sounds great! I read in another post about a coupon for this system at hot exhaust for $575 delivered. Anyone know if it still good or if there is a new one?

I noticed when I changed the oil the bolt heads from the cat to the tubes are welded to the flanges, so you will at least need something like an electric grinder or a cut off tool.
Not at all. Just remove the nuts and you're good to go. :)

As far as I know the coupon is still good. If I remember right the code is fordtruck8. I have already ordered and paid for mine. Just waiting for them to ship. Getting anxious.

Have they given you a ship date??

Have they given you a ship date??

I was told by hottexhaust that I would have it by the end of this week! I hope that is correct I will post as soon as I get mine.

I was told by hottexhaust that I would have it by the end of this week! I hope that is correct I will post as soon as I get mine.

It says second week of May on their site.

Looks like I will be going with the MF as SF stopped making his bolt ons. It's only a couple hundred more for a full system so not too bad IMO. Hell I paid 1100 bucks for my last full motorcycle exhaust so this is as cheap as chips in comparison.:)

It says second week of May on their site.

Looks like I will be going with the MF as SF stopped making his bolt ons. It's only a couple hundred more for a full system so not too bad IMO. Hell I paid 1100 bucks for my last full motorcycle exhaust so this is as cheap as chips in comparison.:)

The second build cycle has been authorized and more parts are in queue. You shoudl not be waiting too long.

WOOT...

May 30, 2008 5:31 AM
On FedEx vehicle for delivery
IRVING, TX

The second build cycle has been authorized and more parts are in queue. You shoudl not be waiting too long.

Sweet! I am going to buy it in hopes that it'll fit the 2009... I can't see them making any major exhaust changes... Right??

Is it pretty much a bolt on system or are special tools needed?

As much as I do not anticipate any major changes our catalog department is searching all available resources for 2009 data. We should have the balance of 2009 data shortly ... This information is being compiled for our next brochure / catalog release coming VERY soon.

Would be interested to hear from anyone that installed this kit themselves how difficult or easy it was? Does the Magnaflow kit use clamps or is welding required?

Being a Master Technician with a lift it was very easy. The passenger side fit perfect, but the drivers side had to trim 1/2 off pipe between x and muffler at the muffler side. other then that 10 mins it was all off and 1 hour with the minor fabrication. I only have 700 miles on the car, but with all the goodies it moves!

Being a Master Technician with a lift it was very easy. The passenger side fit perfect, but the drivers side had to trim 1/2 off pipe between x and muffler at the muffler side. other then that 10 mins it was all off and 1 hour with the minor fabrication. I only have 700 miles on the car, but with all the goodies it moves!

Nice. Can U post vids from inside and out and some pics as well.

Ordered from Hottexhaust.com today - when will I get it?? That's a mystery to me at this point. Get those guys working double time, we need these things pronto. We have a serious silent exhaust condition we need a cure for!

And then I can.........

:gears:

and

:D

Ordered from Hottexhaust.com today - when will I get it?? That's a mystery to me at this point. Get those guys working double time, we need these things pronto. We have a serious silent exhaust condition we need a cure for!

And then I can.........

:gears:

and

:D

Did U get it for $579 and they hav no glue when its going to ship?

Did U get it for $579 and they hav no glue when its going to ship?

I ordered it online for $579 with the coupon. I'm just going off of the delayed ship times of others and the post about a second run of them being built. Hopefully it doesn't sound bad with AFM.

Nice. Can U post vids from inside and out and some pics as well.

Gman I plan on doing a real good video this weekend from inside the car and some outside the car.

Gman I plan on doing a real good video this weekend from inside the car and some outside the car.

Thanks GRRRR8. That will be helpful.

Gman I plan on doing a real good video this weekend from inside the car and some outside the car.

Gman, from your sig, "CAM, HEADERS AND LINGENFELTER TORQUE CONVERTOR". What cam are you looking at?

Gman, from your sig, "CAM, HEADERS AND LINGENFELTER TORQUE CONVERTOR". What cam are you looking at?

Thats not me, its GRRRR8s sig

Thats not me, its GRRRR8s sig

oops, sorry.

:drink:

Being a Master Technician with a lift it was very easy. The passenger side fit perfect, but the drivers side had to trim 1/2 off pipe between x and muffler at the muffler side. other then that 10 mins it was all off and 1 hour with the minor fabrication. I only have 700 miles on the car, but with all the goodies it moves!

I installed mine today and I noticed that the fit on the drivers side wasn't as good as the passenger side as well. Do you have any pictures of where you trimmed a 1/2-inch off?

I didn't have a lift, just a 3-ton jack and 2 jack stands. I'm beat now!

The old setup came out very nice and easy and the new setup went in pretty well, except what I mentioned above.

Here are some pictures and I have videos at home too that I can render and upload later tonight. I took a video of stock first, then a video of the Magnaflow after.

http://www.davetech.net/pics/g8gt/temp/DSC04793.JPG

http://www.davetech.net/pics/g8gt/temp/DSC04794.JPG

http://www.davetech.net/pics/g8gt/temp/DSC04795.JPG

http://www.davetech.net/pics/g8gt/temp/DSC04796.JPG

http://www.davetech.net/pics/g8gt/temp/DSC04797.JPG

http://www.davetech.net/pics/g8gt/temp/DSC04798.JPG

http://www.davetech.net/pics/g8gt/temp/DSC04799.JPG

http://www.davetech.net/pics/g8gt/temp/DSC04800.JPG

http://www.davetech.net/pics/g8gt/temp/DSC04801.JPG

http://www.davetech.net/pics/g8gt/temp/DSC04802.JPG

Oh, and the best part is that this is my wife's car and she doesn't know that I even did this to her car today. I saw that it was delivered at 9:30am this morning, so I left work and drove to where she works and swapped my car with hers (she works at a high school). Then drove home, changed into some car-work clothes and got it done in about 2 hours total. I went inside, cleaned up and ate some lunch, then took the car back to her parking spot at work.

Before I took her car, I measured where her seat was since she's 5'5" and I'm 6'1". I also measured the tilted steering and returned that to normal. I wish I were there to see her reaction when she fires it up.

On the drive back, I definitely noticed that you can here AFM more now, but the sound is awesome....it should sound like this stock!

Right on, that's really cool of you. Hopefully Magnaflow is paying attention to these comments and corrects the issue, and provides us with what needs to be done if we get a system that has already left their fabrication shop.

Oh, and the best part is that this is my wife's car and she doesn't know that I even did this to her car today. I saw that it was delivered at 9:30am this morning, so I left work and drove to where she works and swapped my car with hers (she works at a high school). Then drove home, changed into some car-work clothes and got it done in about 2 hours total. I went inside, cleaned up and ate some lunch, then took the car back to her parking spot at work.

Before I took her car, I measured where her seat was since she's 5'5" and I'm 6'1". I also measured the tilted steering and returned that to normal. I wish I were there to see her reaction when she fires it up.

On the drive back, I definitely noticed that you can here AFM more now, but the sound is awesome....it should sound like this stock!

thats funny. i would love to be there and see the expression she gives.

Way to go DuBob!

Let us know what SHE thinks... I wonder if she'll call you when she starts it up thinking something is wrong...:)

I installed mine today and I noticed that the fit on the drivers side wasn't as good as the passenger side as well. Do you have any pictures of where you trimmed a 1/2-inch off?

Can you please expand on this a bit? Obviously you got it installed but with what side-effects? Does one tip stick out a half inch farther or what?

Installed mine and had similar issues as others have stated. The passenger side goes on great. The drivers side is too long and needs to be trimmed in order to get a decent fit.

Side note, is that a legit jack point? The GTO had a lift spot just behind the rear end. Looks like you jacked right on the diff?

Installed mine and had similar issues as others have stated. The passenger side goes on great. The drivers side is too long and needs to be trimmed in order to get a decent fit.

Where did you trim the pipe on the drivers side? Guess it's time to charge up the Milwaukee 28V cordless bandsaw. :)

exhaust does sound nice :)

The stock tips look smaller than the magnaflow tips. I thought they were the same diameter as the stocker - can those with this exhaust or oxidizer confirm?

Here's the video I took earlier today:
10-meg WMV (http://www.davetech.net/vids/g8-magnaflow.wmv)

Here's the video I took earlier today:
10-meg WMV (http://www.davetech.net/vids/g8-magnaflow.wmv)

THanks. It definitely sounds good.

Sounds good. Not too loud, which is what I want. I'm still young enough that I like to hear the exhaust. :)

Thanks for the exhaust video! Magnaflow is the way I'm going on exhaust, now to figure out what headers to get.........

Hey DuBob: Are you happy with it? And is there any cabin drone? It sounds perfect on the sound loudness.

Thanks for the video. That doesn't sound much louder than stock. How much sound is there inside the car during regular driving?

Hey DuBob: Are you happy with it? And is there any cabin drone? It sounds perfect on the sound loudness.

Magnaflow did their homework with this one, it's perfect so far. I'd like to get it on the highway and hear how it is, but I do not expect any drone whatsoever.

It's definitely louder than stock from the outside. For the first time this morning, I heard her leaving the driveway with it, then going down the side street.

Inside the vehicle is similar to mustang/camaro. No drone. Very quiet in 6th gear. If u cruise in M3-4 sounds real good. It sounds real good manually shifting at 3300-3800.

Remember that the Mag's will get about 30% louder per Stolen Fox.

They are packed so like many a A/M motorcycle exhaust they will increase in volume over time!

Yippee!

I plan on doing a real good video this weekend from inside the car and some outside the car.

Hey GRRRR8, did ya get any vids yet? I'm looking forward to hearing some cilps before I buy a kit.:whine:

Hey the sounds great! Way better the stock!! Do you think we could get some more footage of in car and maybe a WOT run? If not thats cool, but i love it!!

Hey GRRRR8, did ya get any vids yet? I'm looking forward to hearing some cilps before I buy a kit.:whine:

DuBob's got some comparison vid's and photos (Thanks!)
http://www.davetech.net/vids/g8-magnaflow.wmv
http://www.davetech.net/pics/g8gt/temp/

TIP ALIGNMENT PROCEDURE (Read before cutting):
http://www.g8board.com/forums/showpost.php?p=52138&postcount=85

i would like to hear the interior noise or a drive by. wonder what this sounds like with an h-pipe too

Hey GRRRR8, did ya get any vids yet? I'm looking forward to hearing some cilps before I buy a kit.:whine:

Hey Gman I got really busy at work this weekend and didnt even get the car out. I apologize. I have had Bassani, Borla, Corsa, B&B, SLP as well as cheaper hand made exhausts. For the price it is very hard to beat Magnaflow. I install at least 20 systems of theirs a month and have NEVER had 1 complaint of any kind. I will say on some systems a minor trimming of pipe for absolute perfection is necessary, but they are 100% bolt on. I did my G8 in less then 1 hr with trimming and all. For basic bolt-ons do VMS ecm/tcm/Rotofab and Magnaflow and you will run sub 5 sec 0-60 with good gas mileage, perfect drivability. Hope this help you on your investment. Charlie

[QUOTE=oxidizr;52145]DuBob's got some comparison vid's and photos (Thanks!)

Photos are great and the vid sounds good at idle but, its hard to hear the ture sound cuz the mic is to close to the exhuast. The more vids people put up the more helpful it will be for all of us. Thanks to all.

[QUOTE=oxidizr;52145]DuBob's got some comparison vid's and photos (Thanks!)

Photos are great and the vid sounds good at idle but, its hard to hear the ture sound cuz the mic is to close to the exhuast. The more vids people put up the more helpful it will be for all of us. Thanks to all.

Unless you have professional data recording equipment it will be difficult to get a good range of sound. Most camcorders or like devises use an automatic mic gain which boost the level for softer sounds and reduces gain for louder. In the case of exhaust, the dba range changes so quickly during reving that the devise cannot react fast enough causing peak distortion.

With that in mind, also consider most any file uploaded to the internet is going to be compressed drastically limiting the range of sound. Our DAT recording files for our internet clipw start out at over 15 megs and need to be compressed down to more reasonable sizes.

Unless you have professional data recording equipment it will be difficult to get a good range of sound. Most camcorders or like devises use an automatic mic gain which boost the level for softer sounds and reduces gain for louder. In the case of exhaust, the dba range changes so quickly during reving that the devise cannot react fast enough causing peak distortion.

With that in mind, also consider most any file uploaded to the internet is going to be compressed drastically limiting the range of sound. Our DAT recording files for our internet clipw start out at over 15 megs and need to be compressed down to more reasonable sizes.

If you need me to host larger sounds files so members can get more of an idea how the exhaust sounds let me know becuase i have a nice hosting package i can let the members download from.

Hey Everyone,

I received my Magnaflow Cat-Back system yesterday afternoon, and proceeded to install it this morning. All told it took me around 2 hours to do the install on my own. Maybe a bit longer, and probably after I tweak the pipes to perfection, 3 hours or so. I still need to tweak the drivers side pipe just a bit as the inside tip is a bit higher than the outside tip. Or I need to tweak the passenger side pipe to match, since those tips are nice and level.

Some tips:

1. I backed my car onto a set of Rhino ramps, no jacking in the back required.
2. I jacked up the front left and right sides, and put a big concrete block about 4" thick under each tire. That gave me ample room to work under the car without using jack stands. I then used my floor jack under the center cross member as a safety net.
3. You really only need a few tools. A deep and shallow 15mm socket, a 15mm box end wrench, a 12" extension, ratchet, and a 13mm socket for the rear exhaust hangers.
4. Some soapy water on a wad of paper towels to wet the exhaust hangers, which makes removing them a piece of cake.
5. Before adjusting the system, reinstall the center brace on the prop shaft tunnel so that you can make sure to get clearance above it for the pipes. Shoot for at least 1/4", if not 3/8".
6. Have a hacksaw or a bandsaw available to do some pipe trimming. A big pipe cutter would work too.
7. Working in your driveway? Buy some cheap moving blankets from Harbor Freight or similar. It helps, a lot. Plus you won't scratch up that new system as you're installing it.
8. Get a friend to help. If you don't have any, get a lot of beer and bribe someone to help. It will make this go a lot faster and easier.
9. Have a 7/8" open end wrench to remove the O2 sensors. Disconnect the harness, pull the the connector end from the transmission mounting boss, and then remove the sensor from the exhaust system. Reinstall prior to tightening down the system for fitment adjusting.
10. Remove the rear most exhaust hangers above the mufflers, and slide them onto the Magnaflow system. The hanger goes on a specific way, so take note which is the "outside" edge of the hanger, so that when you slide it onto the Magnaflow system, it's facing the right direction.
11. As the instruction say, work front to back starting at the X-pipe. When get get to installing the mufflers, slip the muffler pipe onto the mid-pipe, and then raise the system into position. You'll need to rotate the pipes some, but once the tips somewhat fit into the valance opening, install the rear exhaust hanger bolts. Then you can work on final adjustment.
12. Biggest tip of all - make sure you slide the clamps on prior to putting the pipes together. :)

The passenger side went on nicely. However the drivers side was a pain. No matter what I tried, I could not get the hanger to line up at the rear differential, and the muffler hanger was at it's limit in terms of compression against the hangers welded on the muffler. I went through it three times, removing the pipes, trying different mid-pipe rotations, etc. I verified full engagement of each joint, meaning I could not slide the pipes towards the front of the car any further to possibly gain some more wiggle room. Long story short, I cut about 5/8" off of the mid pipe at the rear, where the muffler pipe slides over it. Once I did that, I was able to get the hangers to line up and everything bolted up. As I said above it needs just a tad bit more tweaking, but the band clamps make it very easy to loosen the pipes and make adjustments. I'd say I have it 85% perfect, I'm aiming for 95%+.

As for the sound, well that's subjective. I will say at the start, it's one of the quietest cat back systems I have ever purchased for any vehicle. However I know it will break in some and get louder over time - I'm good with that. What I really think was well done on this system is the tone. It sounds very nice, but won't get people who are standing a mile away looking for you. I would say that just about ANY person could tolerate this system. You can hear it inside, but at idle just barely. At part throttle you can hear it pretty good. Cruising seems good and is not annoying at all. WOT, well I have not went WOT yet. I will follow up, but I'm in the middle of doing a subwoofer install in the truck, and it's not secured yet. :)

I'm pleased with the system - it gives the G8 GT some sound. It's not raspy, and that's the best part of the whole system IMO, I like the low tone. This is my first Magnaflow system, and other than the little pipe tweaking, it went on pretty easily. I'm tired, that much I know.

Just to follow up - WOT sounds pretty good. It's still not overly loud.

AFM / DOD - you can hear it more now than before and I can understand why GM kept the exhaust system quiet. It won't sound quite right to other cars while cruising, and you can hear the AFM more inside of the cabin. However it's not bad, and the trade off for better around town sound, and full mandrel bent pipes is well worth it IMO.

Why the high prices for the exhaust?? I had a tech out her who specializes in exhausts for high performance cars build my cat back, loosing the resonators and using magnaflow flow thru mufflers, installed for 350.00

How does the sound compare to a stock GTO?

I agree with everything unixadm said. When the DOD kicks in, you can now hear it fairly easy, but it is not annoying or anything. Nice instructional post.

How does the sound compare to a stock GTO?

A buddy of mine (with a stock GTO) helped me put my Magnaflow catback on last weekend. Afterwards, we compared the sound differences. We both agreed that the G8 now sounded louder and meaner at partial through WOT. They were very similar at throttle, G8 may have been a bit louder. He is now looking into a Corsa exhaust for his goat since is was very impressed with the results.

I have not got my exhaust tips to line up to my liking yet. It rained all day yesterday, so I am going to try to get them lined up today. My driver side tips look crooked.

unixadm, did you have any luck to finally get yours lined up?

I agree with everything unixadm said. When the DOD kicks in, you can now hear it fairly easy, but it is not annoying or anything. Nice instructional post.



A buddy of mine (with a stock GTO) helped me put my Magnaflow catback on last weekend. Afterwards, we compared the sound differences. We both agreed that the G8 now sounded louder and meaner at partial through WOT. They were very similar at throttle, G8 may have been a bit louder. He is now looking into a Corsa exhaust for his goat since is was very impressed with the results.

I have not got my exhaust tips to line up to my liking yet. It rained all day yesterday, so I am going to try to get them lined up today. My driver side tips look crooked.

unixadm, did you have any luck to finally get yours lined up?

Man I'm sore and have not been outside yet. I just barely got out of bed, with a lot of resistance in doing so. :)

I have my passenger side tips level, but the drivers side inside tip is higher than the outside. What I'm going to do is loosen the rear exhaust clamp, and remove the exhaust hanger near the differential. Then I'll use one of my Snap-On pry bars to try and twist the tips with someone looking. The key is to get the rear pipe connection to turn a little bit. If I can get it to do that, then I'll have someone tighten up that exhaust clamp and reinstall the differential hanger. If I can't get the tip to rotate counterclockwise some, then I'll make the passenger side match.

At this point I'm not sure if I'm going to mess with it today or not. Between installing a Alpine PLT-5 amp in the trunk which does not work correctly in the 95 degree weather yesterday, and crawling around on my back - I'm quickly realizing that getting old sucks. :)

I hear you on the getting old part. :(

On my installation, the inside tip on the drivers side is lower. So, I think we probably got some adjusting that can take place. I am getting ready to go outside and get the car back into the air to see what I can do. I will let you know how it turns out. I may even take some pics...

So I think I found the problem with the crooked driver side pipes. See the pictures below. Also, I misspoke about my driver side pipes. The inside tip is higher like unixadm's which is also obvious from the pictures below. I am going to try to fix the problem. I will repost with my results.

The Left side. Hard to see that it is crooked from the pic.

http://www.oweninfo.com/pictures/g8/pic_1.jpg


The Right side.

http://www.oweninfo.com/pictures/g8/pic_2.jpg


And this is very crooked......
http://www.oweninfo.com/pictures/g8/pic_3.jpg


The stock muffler is very straight.



http://www.oweninfo.com/pictures/g8/pic_4.jpg

Ya, I think I'll wait for the Borla or Corsa. That is just not acceptable!

I was able to tweak mine enough to get them pretty darn close. The one thing I did notice is the tendency of the exhaust hangers at the differential to want to push off the OEM upper mount. This system seems to expand a great deal, so what I did was soap up the exhaust hangers on the Magnaflow cat-back and slid them as far forward as possible. I'll keep checking to see if they stay on now.

Here's the tips after I tweaked them this morning. All told it took around 10 minutes, and I loosened nothing but the rear clamp on the drivers side, removed the differential hanger mount, and twisted the pipe. It's as close as I can get it, but there was a good deal of adjustment left in it.

http://www.dmwtech.com/gallery2/d/4376-2/CIMG0856.JPG

Ya, I think I'll wait for the Borla or Corsa. That is just not acceptable!

Don't get too discouraged. I have used cat backs from Borla, B&B, TRD, FRP, Flowmaster, Hooker, and now Magnaflow. When doing the installation it can be like a jigsaw puzzle, because if one pipe ahead of the other is twisted in such a way that it looks right, but that's now how they designed the system, it will mess up everything behind it. The only one I had drop into place without any fuss was the Flowmaster system on my 1996 F250HD 4x4 with a 7.5L big block. However given the room, it's no surprise. That's why they state leave the system loose for adjustment. It really takes a bit of tweaking to get everything just right, and on most I have had to tweak them over a few days. Sometimes you cannot get it fixed by mucking about with the pipes, so you need to heat the hangers and bend them. Others like this one required a little pipe trimming. Doing it on the lift makes it much easier than in your driveway. For example installing this system was far easier than installing the Hooker system on my 1994 Caprice 9C1/LT1. Straight axles require the pipes to go up and over the rear axle, which makes the install that much more of a pain. I really like the sound, but each system is going to have some issues coping with the AFM/DOD sounds. I was NOT impressed with the Corsa sound on the 2006 Mustang GT. I ended up going Borla, and it was loud as hell, but sounded great.

OK, I think it is mostly straight now. Once I bent the hangers to make my levels straight, all went on fine. Here is the after photos.

http://www.oweninfo.com/pictures/g8/pic_5.jpg

http://www.oweninfo.com/pictures/g8/pic_6.jpg

I am a lot more happy with the results now. Looks and sounds good.

Looks great!

Perhaps if I get this kit I will have a shop install it, then I wouldn't have to hassle with it, my time is limited. I have had Borla's before and loved the sound. I think the gto's on the Corsa web page sound awesome and the no drone is a huge plus. You guys say this system doesn't drone though right? Just depends if I can have the patients to wait, not likely. I just don't want a system that drones at all, yet I want it to sounds mean as hell.

Can anyone please got a sound clip WOT?? I would love to here how it sounds doing that.

I may also have a shop do it too. After seeing all the touble to get it straight just dont have the time like i used too.

Can anyone please got a sound clip WOT?? I would love to here how it sounds doing that.

I may also have a shop do it too. After seeing all the touble to get it straight just dont have the time like i used too.

Did you listen to the ones on Magnaflow's website?

well ive had magnaflow a few times and i have to say i love the sound and performance, however i noticed the same thing on my srt4 the drivers pipe was about 1-2 inches shorter the the pass side. so that annoyed me that one pipe stuck out like it was supposed to and the other was in the bumper mold. its a problem they seem to have but the sound and performance makes up for it in my eyes. i really want this system but i dunno if i can justify all the money for it or not at this point.

For under $600, this is a good system being that it's full stainless. I also like the engineering that went into the sound aspects, for no drone and minimal AFM noise.

The fitment is not bad in terms of inches. So no need to worry there, and if there is a fitment issue, a hacksaw and a couple of minutes can fix that. It sounds very good at part throttle, and it certainly has a different sound to it. I'd say it's closer to my old B&B Tri-Flow exhaust that I installed on my 1999 Trans Am WS6 with an LS1.

I'm 31 now, so the loud and annoying systems are not for me anymore, at least on a 4dr sedan I'd consider taking on long drives. This has enough noise to let people know it's got a V8 under the hood, but not enough to have every Police Officer in town looking for you. The stock system could have been hiding just about any engine under the hood and you wouldn't know it.

I just got back on the first highway trip with the wife since the cat-back install. She did say that it is louder on the highway, but didn't think that it was that bad. Like unixadm said, the install time is under two hours. That includes removing the old system. If I didn't install my system at 2100, I think I would have had it right the first time. I only spent 1.5 hours to readjust the system and I was taking my sweet time. In terms of fit, I didn't have to cut anything, but I did have to bend the hangers.

BTW, the kids passed right out in back seat. I think the hum knocked them out.:zzz:

I also applied my second coat of Zaino today. I need to get the windows tinted........ (Thread hijack)

http://www.oweninfo.com/pictures/g8/pic_zaino.jpg

Having see your concerns I have just reinstalled a production kit on the G8 and did not need to make any modifications. Regarding the tip orientation, if you snug the pipes only enough to hold them in place (as per the instructions), you can extend and rotate the pipes to get the tips to exit level. I will say I had the car on a lift which makes this easier to get under make an adjustment and then see the result but on jack-stands the aid of a second person to give you feedback as to the level of the tips will make this much faster. With as many slip fits we placed the tubing will allow for a great deal of adjustment. Take you time if you are working alone or get a second set of eyes out back while you are adjusting.

If your problems persist I may see if i can get some company resources and put together a installtion video clip with recommendations and tips for alignment fitment. No promises yet as our equipment is still arriving back from the Hot Rod Power Tour last week.

Hey Richard - any news/progress on the 'quiet' system?

Having see your concerns I have just reinstalled a production kit on the G8 and did not need to make any modifications. Regarding the tip orientation, if you snug the pipes only enough to hold them in place (as per the instructions), you can extend and rotate the pipes to get the tips to exit level. I will say I had the car on a lift which makes this easier to get under make an adjustment and then see the result but on jack-stands the aid of a second person to give you feedback as to the level of the tips will make this much faster. With as many slip fits we placed the tubing will allow for a great deal of adjustment. Take you time if you are working alone or get a second set of eyes out back while you are adjusting.

If your problems persist I may see if i can get some company resources and put together a installtion video clip with recommendations and tips for alignment fitment. No promises yet as our equipment is still arriving back from the Hot Rod Power Tour last week.

Thanks! :)

I got mine installed today at a buddy of mines shop. we DID have to work the drivers side to get just right. No cutting was needed just needed to play with it for a while and use some elbow grease.
For you guys doing it in your driveway i dont see how lol. The lift was priceless to have for twisting and orienting the tips just right. Love the sound and the look, just not happy with my gash in my bumper heh....

Well worth the $574!!

I didn't have any issues adjusting the tips, but the pipes would not slide any more forward to get the hangers lined up on the drivers side. I can't really figure out why some people have to cut the pipes, and others don't. However after three tries from the X-pipe back, I gave up and cut the pipe which resulted in the system going on just like the passenger side. It seems weird that the drivers side has been the only problem side mentioned on the forum - you would think others would mention issues on the passenger side if it were a simple issue of rotating the pipes. There is only so much wiggle room to rotate them and the pipes only have so much room to slip. With my pipes marked with a sharpie, I knew I could not slide them further into the slip joint. I don't mind working in the driveway, it's not a big deal. I should have taken pictures or some HD video, there just was not any way to get it to line up.

I just put my system in last night. I did have a small adjustment issue with the driver’s side, but managed to work it out. The tips are level and extend the same amount side to side. I love the sound at idle and when you get on it. However, I am getting a bad drone at low rpm's. I am trying to figure a way to remove the drone which I am sure is tailpipe resonance. The stock exhaust uses resonators and stiff bracing to remove this issue. It is my belief that if the mid-pipes are connected either by a cross pipe or bracing toward the back the drone would go away. I may use some sort of connected couplers across the mid-pipes to test my theory. I have checked every hanger, coupler and nut for tightness and there is no issue. Anyone else getting drone?

--Mike

Hey Richard - any news/progress on the 'quiet' system?

The validation vehicle is scheduled for next week (06/23) and we will also be working on High Performance Catalyst pipes for this application.

Based upon final results we should have release dates, new pictures and sound clips to follow.

I just put my system in last night. I did have a small adjustment issue with the driver’s side, but managed to work it out. The tips are level and extend the same amount side to side. I love the sound at idle and when you get on it. However, I am getting a bad drone at low rpm's. I am trying to figure a way to remove the drone which I am sure is tailpipe resonance. The stock exhaust uses resonators and stiff bracing to remove this issue. It is my belief that if the mid-pipes are connected either by a cross pipe or bracing toward the back the drone would go away. I may use some sort of connected couplers across the mid-pipes to test my theory. I have checked every hanger, coupler and nut for tightness and there is no issue. Anyone else getting drone?

--Mike

Of the three cars I have worked with to date I have not experienced any drone issues. During AFM, the exhaust frequency pitch shift IS noticable where stock it was felt more than heard. The volume or dba difference even still was no more than 1-2 dba at MAX while cruising. I am not saying that you are not experiencing higher noise levels but only that I have not experienced "drone."

I would be curious to know if any others running aftermarket intakes with the silencers removed have had similar issue. All the vehicles we have tested have been 100% stock down to the wheel and tire combo. In some cases, Harmonics intorduced by intakes have created higher noiseleves and ven heavier aftermarket wheels effect vehicle load and wheel and tire combos that alter rolling diamater effect the cruising mph vs rpm for which the exhaust system was tuned.

All that aside, going back to the first post in this thread you can also see that this kit is the louder of the two we intend to offer.

16795 - 2.5" Stainless Steel dual cat-back with Tru-X and Quad Tips. Finalized

XXXXX - 2.5" Stainless Steel dual cat-back with Tru-X and XXXX Tip(s) - In Development. Performance exhaust geared for subtle sound level changes over stock.

Sport sedans are in particular difficult vehicles to provide a single exhaust for as individual preferences vary as some want a High Performance sedan with a good deal of presence and other want a more sublte presence ... just a bit more than stock (which is what our second exhaust offering addresses.)

Of the three cars I have worked with to date I have not experienced any drone issues. During AFM, the exhaust frequency pitch shift IS noticable where stock it was felt more than heard. The volume or dba difference even still was no more than 1-2 dba at MAX while cruising. I am not saying that you are not experiencing higher noise levels but only that I have not experienced "drone."

I would be curious to know if any others running aftermarket intakes with the silencers removed have had similar issue. All the vehicles we have tested have been 100% stock down to the wheel and tire combo. In some cases, Harmonics intorduced by intakes have created higher noiseleves and ven heavier aftermarket wheels effect vehicle load and wheel and tire combos that alter rolling diamater effect the cruising mph vs rpm for which the exhaust system was tuned.

All that aside, going back to the first post in this thread you can also see that this kit is the louder of the two we intend to offer.

16795 - 2.5" Stainless Steel dual cat-back with Tru-X and Quad Tips. Finalized

XXXXX - 2.5" Stainless Steel dual cat-back with Tru-X and XXXX Tip(s) - In Development. Performance exhaust geared for subtle sound level changes over stock.

Sport sedans are in particular difficult vehicles to provide a single exhaust for as individual preferences vary as some want a High Performance sedan with a good deal of presence and other want a more sublte presence ... just a bit more than stock (which is what our second exhaust offering addresses.)

I never thought about the intake. That would be easy to test and I will get on it this coming weekend. The drone is very loud and noticable, kind of numbs your ears for the short time it's in the drone rpm range. If the intake doesn't work I may try a pair of stainless resonators close to to were the stock exhaust had them. Anyone else with mods getting drone?

--Mike

The validation vehicle is scheduled for next week (06/23) and we will also be working on High Performance Catalyst pipes for this application.

Based upon final results we should have release dates, new pictures and sound clips to follow.

Excellent, please keep us posted. Thanks. :driving:

I have had my MF catback for about two weeks now. It was completely stock up until Tuesday. Prior to Tuesday, the exhaust would hum a bit, but I would not call it drone, when traveling down the highway. Tuesday I put a RF CAI on, and it actually made the exhaust a bit quieter going down the highway. I don't know the science behind it, but even my wife noticed the difference last night.

I'm happy as a pig in mud with ours.......with the cooler weather we've had the last few days, I've been enjoying driving with the windows down and in Manu-matic mode.

It's probably be us getting use to it, but at times I almost think it has gotten quieter. I think I forgot how quiet the stock setup is.

I figure if we want it any more louder, I'll install a set of LT headers. ;)

Can anyone please got a sound clip WOT?? I would love to here how it sounds doing that.

I may also have a shop do it too. After seeing all the touble to get it straight just dont have the time like i used too.

I found this clip on youtube:

http://www.youtube.com/watch?v=ifGK5xIbd7k

I found this clip on youtube:

http://www.youtube.com/watch?v=ifGK5xIbd7k

Our kit has notably different tone. Our cat-backs use proprietary muffler core designs and are paired to specific tube profiles. Our universal parts will provide similar tone and performance however cat-backs are engineered to be application specific.

MAGNAFLOW Video Clips (http://www.magnaflow.com/04sound/sportsound/08G8/08G8.html)

I put a few videos for download on my site.

http://www.dmwtech.com/gallery2/v/vehicles/g8gt/mf/

I'll put them up on Youtube in the next day or two, but for now, be easy on my site. The video was taken at 1920x1080 and then I did some conversions. It's in DIVX format, so make sure you have a codec and/or player from http://www.divx.com. Nothing special, my camera was rattling because I had it mounted to the headrest, etc. Windows up for all but a couple of the videos, with the A/C on. WOT a couple of times, nothing over 85mph. Sorry. :)

I put a few videos for download on my site.

http://www.dmwtech.com/gallery2/v/vehicles/g8gt/mf/

I'll put them up on Youtube in the next day or two, but for now, be easy on my site. The video was taken at 1920x1080 and then I did some conversions. It's in DIVX format, so make sure you have a codec and/or player from http://www.divx.com. Nothing special, my camera was rattling because I had it mounted to the headrest, etc. Windows up for all but a couple of the videos, with the A/C on. WOT a couple of times, nothing over 85mph. Sorry. :)

Like the sound Clips!

I think I will try sampling the interior noise levels next chance I get.

Hmm i downloaded a few clips and when i open them it says parameters incorrect. Yes i do have Divx.

Edit nvm must just been a vista thing. Works fine on my XP box.

I like it, could be a tad bit louder but hey im still buying it!

I put some more videos up. The loudness is partly my Sony HD Camcorder - it seems to auto balance the sound levels, so it's a bit deceiving. I have about 400 miles on the exhaust now and it seems like it's getting a bit louder already. I really like the sound of the exhaust - in AFM - not so much. I have not followed my car while in AFM cruise, but I think it might sound like it ate a bunch of burritos the night before! :)

But get on the go pedal and the sound is very nice. The exhaust did the trick, because now the car gets some attention. The Breyton's don't hurt either I suppose, but the noise gets people to look, and then they god "OHH DAMN... that nice...". I had a guy in a HUGE like flat bed truck following me down my street today while I was coming home. He stops in the middle of the street and say "Oh that's the first G8 I've seen in the flesh and that thing is BAD". So I yelled out my window for like two minutes with this dude and he was drooling all over it. I thought I was going to get car jacked or something! haha. :)

I have about 400 miles on the exhaust now and it seems like it's getting a bit louder already. I really like the sound of the exhaust - in AFM - not so much. I have not followed my car while in AFM cruise, but I think it might sound like it ate a bunch of burritos the night before! :)



Thanks for posting these clips. I have to say though, I'm now more concerned over the exhaust sound when afm kicks in. It sounds significantly louder inside the car with the exhaust, and the sound certainly isn't pleasant. I know it's highly subjective but how intrusive is afm with the exhaust? Sounds like a long, constant fart! I'm hoping it's really just accentuated by the recording, but it sounded pretty loud in the cabin with the windows up.

Thanks for posting these clips. I have to say though, I'm now more concerned over the exhaust sound when afm kicks in. It sounds significantly louder inside the car with the exhaust, and the sound certainly isn't pleasant. I know it's highly subjective but how intrusive is afm with the exhaust? Sounds like a long, constant fart! I'm hoping it's really just accentuated by the recording, but it sounded pretty loud in the cabin with the windows up.

I'm running a full Borla catback on my Z60 5.3 AFM Silverado. You have to research if the exhaust company has done any work towards reducing drone while in the V4 mode. For the Silverado, only Borla and Corsa had done this type of research when developing their systems, (this is according to my research at the time [July '07] and there may be more companies that offer this as of June '08). I get a different exhaust tone while in V4 but it's not annoying by any means. The only annoying thing is when I'm doing about 75mph on the highway and the engine switches between V4 and V8 mode and you can hear the change. This is quite frequent if there is a headwind that pulsates periodically or there are hills that pop up that change the requirement for the V8 mode to kick in.

It's going to be very difficult to mask AFM with any exhaust that isn't silent like the OEM system, which has got to be one of the biggest reasons the G8 GT came stock with such a elaborate and quiet exhaust system.

You can hear the AFM, but I expected to hear the AFM. When the rest of the exhaust is audible, the AFM will be as well. I don't find it overly intrusive inside the cabin. I mean if you are listening to some music, driving down the highway - it's something you get used to in a hurry. If you don't want AFM noise, cruise above 75mph. However this is why I recommended to people on this forum to keep their exhaust. I'm a pretty picky bastard, and it's really not that bad. But all I can say is try to find someone local and listen for yourself.

I'm running a full Borla catback on my Z60 5.3 AFM Silverado. You have to research if the exhaust company has done any work towards reducing drone while in the V4 mode. For the Silverado, only Borla and Corsa had done this type of research when developing their systems, (this is according to my research at the time [July '07] and there may be more companies that offer this as of June '08). I get a different exhaust tone while in V4 but it's not annoying by any means. The only annoying thing is when I'm doing about 75mph on the highway and the engine switches between V4 and V8 mode and you can hear the change. This is quite frequent if there is a headwind that pulsates periodically or there are hills that pop up that change the requirement for the V8 mode to kick in.

This makes sense. Maybe Oxidizer can chime in and share what sort of work MF has done to address V4 mode drone? It would appear they've done some quality R & D given what he's already shared with everyone on the development of their cb system.

A part of me wants to just kill the AFM when I get a tune. Then again, I like getting 24-25 mpg on highway trips! Wonder what it would drop to without AFM? Ahhh but I digress . ..

I'm running a full Borla catback on my Z60 5.3 AFM Silverado. You have to research if the exhaust company has done any work towards reducing drone while in the V4 mode. For the Silverado, only Borla and Corsa had done this type of research when developing their systems, (this is according to my research at the time [July '07] and there may be more companies that offer this as of June '08). I get a different exhaust tone while in V4 but it's not annoying by any means. The only annoying thing is when I'm doing about 75mph on the highway and the engine switches between V4 and V8 mode and you can hear the change. This is quite frequent if there is a headwind that pulsates periodically or there are hills that pop up that change the requirement for the V8 mode to kick in.

Indeed the AFM V4 mode is something that must be researched. We have done a good deal of testing and also considered a good deal of consumer input. Masking AFM does take a good deal away from the V8 note and will have some effect on net flow capacity. There are tradeoffs and understanding how each vehicle demographic will respond is essential. A system that masks well but is "too quiet" will indeed fall short of expectation as the system that is "too loud." I think you will be hard pressed to find another manufacturer that is willing to share as much information about our development as MAGNAFLOW.

In any case, we have had every intention of offering a system to meet both types of consumers as though not only product development but consumer demographic studies have found that not just one exhaust will satisfy the majority of enthusists.

Stay tuned for our other offerings. As mentioned before, we will have a quiet system as well as an sxle-back for those who plan to run down the LT header route. Oh wait did I say an axle-back? :) Oh and for those looking for some better flowing mid-pipes, expect to see metallic spun cats for the G8 very shorty...

Stay tuned.

This makes sense. Maybe Oxidizer can chime in and share what sort of work MF has done to address V4 mode drone? It would appear they've done some quality R & D given what he's already shared with everyone on the development of their cb system.

A part of me wants to just kill the AFM when I get a tune. Then again, I like getting 24-25 mpg on highway trips! Wonder what it would drop to without AFM? Ahhh but I digress . ..

I'll let you know. I am tuning a G8 currently and will be working with AFM ON and OFF as well as tweaking its intervention level. I'll post my tunes and results for those interested. I will have some MPG results soon.

I'll let you know. I am tuning a G8 currently and will be working with AFM ON and OFF as well as tweaking its intervention level. I'll post my tunes and results for those interested. I will have some MPG results soon.

Awesome - thanks!

Indeed the AFM V4 mode is something that must be researched. We have done a good deal of testing and also considered a good deal of consumer input. Masking AFM does take a good deal away from the V8 note and will have some effect on net flow capacity. There are tradeoffs and understanding how each vehicle demographic will respond is essential. A system that masks well but is "too quiet" will indeed fall short of expectation as the system that is "too loud." I think you will be hard pressed to find another manufacturer that is willing to share as much information about our development as MAGNAFLOW.

In any case, we have had every intention of offering a system to meet both types of consumers as though not only product development but consumer demographic studies have found that not just one exhaust will satisfy the majority of enthusists.

Stay tuned for our other offerings. As mentioned before, we will have a quiet system as well as an sxle-back for those who plan to run down the LT header route. Oh wait did I say an axle-back? :) Oh and for those looking for some better flowing mid-pipes, expect to see metallic spun cats for the G8 very shorty...

Stay tuned.


You ROCK! This is why I bought a MF system! :)

I'll let you know. I am tuning a G8 currently and will be working with AFM ON and OFF as well as tweaking its intervention level. I'll post my tunes and results for those interested. I will have some MPG results soon.


Heck yea, let us know!!!

I put a few videos for download on my site.

http://www.dmwtech.com/gallery2/v/vehicles/g8gt/mf/

I'll put them up on Youtube in the next day or two, but for now, be easy on my site. The video was taken at 1920x1080 and then I did some conversions. It's in DIVX format, so make sure you have a codec and/or player from http://www.divx.com. Nothing special, my camera was rattling because I had it mounted to the headrest, etc. Windows up for all but a couple of the videos, with the A/C on. WOT a couple of times, nothing over 85mph. Sorry. :)
You sir have convinced me to save up and buy myself the Magnaflow system. Your car sounds exactly how I want mine to sound. I just listened to a lot of your sound clips/videos on your site and am very impressed.

A nice low growl when cruising, but it really seems to yell when you get on it. Perfect sound, imo.

You ROCK! This is why I bought a MF system! :)

Unofficial Axle-back preview ...

http://www.magnaflow.com/richard/08PontiacG8GT/G8%20A-B.JPG

Preliminary data shows a MAX 4-5 HP with a substatial bump in noise level output. This muffler is designed with the intent of being installed behind LT header combinations which eliminate the stock mid-pipe assembly.

Performance Catalyst preview ...

http://www.magnaflow.com/richard/08PontiacG8GT/G8%20cat%20OEM%20vs%20perf.JPG

Initial analysis show the OEM cat flowing 257-259 CFM @ 28" / catalyst assembly.

http://www.magnaflow.com/richard/08PontiacG8GT/OEM%20flow.JPG

The replacement unit has been redesigned for better inlet flow and higher capacity with a 250 cell Metallic substrate. Flow bench numbers are in process.

Unofficial Axle-back preview ...

http://www.magnaflow.com/richard/08PontiacG8GT/G8%20A-B.JPG

Wait, you're planning on offering axle-backs?! THANK YOU! :wink2:

Wait, you're planning on offering axle-backs?! THANK YOU! :wink2:

Aside from offering headers, we want to be your premier exhaust provider.

Aside from offering headers, we want to be your premier exhaust provider.

I'm pitching a tent... :)

Me likey the cats!

Hmmmm, any idea (ball-park) what kind of HP gains from the performance cats?

Hmmmm, any idea (ball-park) what kind of HP gains from the performance cats?

I will have exact data shortly ... The gains will be influenced by which cat-back is used. (OEM / MAGNAFLOW standard / MAGNAFLOW quiet / MAGNAFLOW axle-back)

Can we assume the new cats will mate up perfectly with the MagnaFlow cat-back (Magnaflow standard I assume, didn't know there were others)?

I am starting to become a life long Magna-flow customer and I haven't even installed my exhaust yet...:slap:
:)

Can we assume the new cats will mate up perfectly with the MagnaFlow cat-back (Magnaflow standard I assume, didn't know there were others)?

These are in fact "direct-fit" replacement for the OEM parts which means they will in fact bolt right up.

I will have exact data shortly ... The gains will be influenced by which cat-back is used. (OEM / MAGNAFLOW standard / MAGNAFLOW quiet / MAGNAFLOW axle-back)

The Magnaflow Standard and Magnaflow Quiet should be nearly identical performance-wise, yes? (since they're both straight-through, with 2.5" pipe throughout).

The Magnaflow Standard and Magnaflow Quiet should be nearly identical performance-wise, yes? (since they're both straight-through, with 2.5" pipe throughout).

The "Quiet" system has been approved and looks to serve its purpose very well. The AFM frequency was altered and total volume reduced.

Here is the system with the mid-pipe assembly:
http://www.magnaflow.com/richard/08PontiacG8GT/G8%20GT%20quiet.JPG

Some comparitive sound level data:

Stationary Tailpipe - SAE J1169 testing standards
--------------Stock---16795---"Quiet"
Curb idle -------68------77------74
1500 rpm ------69------84------81
3000 rpm ------77------90------87
3/4 Peak HP ---80------94------88

Driving Interior
--------------Stock---16795---"Quiet"
Acceleration
30-40 mph ----71------79-----75
50-70 mph ----73------75-----74

Cruising
40-50 mph ----70------71-----70
60-70 mph ----72------72-----72

Dyno:

BLUE: MAGNAFLOW 16795 - 326.9 HP / 347.7 LB-FT
RED: MAGNAFLOW "Quiet" - 324.1 HP / 342.2 LB-FT

Power Differential between Standard and and Quiet (2.8 HP / 5.5 LB-FT)

STOCK: 313 HP / 333 LB-FT
QUIET: 324.1 HP / 342.2 LB-FT

Gain Over stock: 11 HP / 9 LB-FT

http://www.magnaflow.com/richard/08PontiacG8GT/loud%20vs%20quiet.jpg

I would really like to hear some clips of the Both systems with and with out the the high flow cats, particularly with the afm active.

Ideally I would like a system that sounds mean as hell like the Corsa's on a GTO (with headers and a cam they sound sick) but I don't want drone. I don't mind it loud if it doesn't drone, although I don't like the sound of 95% of loud 4 bangers that I hear (Subaru excluded) so that could pose an issue. I really need to hear what it sounds like with the quiet system. Most of the time when I have heard exhausts with a resonator added in an effort to eliminate the drone it only deepen the sound, lowered the volume some, but did nothing for the drone removal. Solving the drone issue seemed to be all about the exhaust pipe length with the Titan I had. With my Honda I was never able to get rid of it and had to use the stock muffler with a hf cat and larger piping (what a waste).

I still can't hear the afm with stock system (I think I feel it though). So for you guys who have the Magnaflow what does it sound like in afm mode? More like an opposed 4, v4, I4 or just plain crappy drone with no real note to it?

I loved the v8 growl but I spend a lot of time on the free way and drone gets old about 2 min. into it. I would hate to waste my money again. I changed the exhaust so many times on last 2 vehicles, you wouldn't believe it.

Oxidizer, is that actually your G8?

i have to say that it is my g8.

Is this basically a 16795 with an extra muffler (with an additional, internal X in the muffler)?

Here is the system with the mid-pipe assembly:
http://www.magnaflow.com/richard/08PontiacG8GT/G8%20GT%20quiet.JPG

i have to say that it is my g8.

bratt! Looks good

Is this basically a 16795 with an extra muffler (with an additional, internal X in the muffler)?

No. It's a custom internal to alter the pitch of the exhaust note. Still straight through but no addtional X or crossover.

So what did the new cats flow at?

Some strung together clips taken with my Sony HD Camcorder at 1080P, and converted to awful Youtube quality. I didn't spend much time on this, but maybe it will help a few of you get the idea of this system.

http://www.youtube.com/watch?v=G4fUMYhlyaQ

or

http://www.youtube.com/watch?v=G4fUMYhlyaQ

Awesome!

I like the way that sounds.

I also love how he is hauling ass through a residential neighborhood while being nice and tidy with his on point signaling skills. Hehe :)

Thanks
Mike Haddad

I like the way that sounds.

I also love how he is hauling ass through a residential neighborhood while being nice and tidy with his on point signaling skills. Hehe :)

Thanks
Mike Haddad

I'm still working on becoming a CHP Officer - gotta keep the driving clean. I wasn't hauling ass tho - the camera zoom is exaggerating the speed a bit. I just wanted to do some manual shifting to get the exhaust picked up, otherwise if you just ***** foot around, you can barely hear it. Plus if you ***** foot around in that area, you'll probably get car jacked when the car looks as nice as mine. I'm a very clean driver, but sometimes **** happens.

I'm still working on becoming a CHP Officer - gotta keep the driving clean. I wasn't hauling ass tho - the camera zoom is exaggerating the speed a bit. I just wanted to do some manual shifting to get the exhaust picked up, otherwise if you just ***** foot around, you can barely hear it. Plus if you ***** foot around in that area, you'll probably get car jacked when the car looks as nice as mine. I'm a very clean driver, but sometimes **** happens.


Thank you for posting this long clip. Judging from how loud the window sounds when you rolled it down, I'd say the V4 mode really can't be very loud or intrusive and that the system overall sounds killer but is definitely pretty mild volume-wise. Pretty fair assessment?

Thank you for posting this long clip. Judging from how load the window sounds when you rolled it down, I'd say the V4 mode really can't be very loud or intrusive and that the system overall sounds killer but is definitely pretty mild volume-wise. Pretty fair assessment?

I would agree with your assessment.

Thank you for posting this long clip. Judging from how loud the window sounds when you rolled it down, I'd say the V4 mode really can't be very loud or intrusive and that the system overall sounds killer but is definitely pretty mild volume-wise. Pretty fair assessment?

If you listen to the radio while driving with the windows up, AFM will hardly be detectable. If you drive around with the windows up, listening for AFM, then you will hear it. At first I noticed it quite a bit more, but I've gotten used to it over the last week or two. I could summarize it this way. If you were cruising at 65mph in V8 mode, it would be a bit quieter in the cabin than cruising at 65mph in V8 mode. If you have the windows down, you cannot really hear it go into AFM mode at higher speeds. Stock you could just barely tell it went into AFM, it's certainly more noticeable now. At 50mph and below, you'll probably hardly notice it. AFM from 50-70mph, it becomes a bit more apparent. Much after 70mph, AFM no longer kicks in. It does NOT bother me, though I know it doesn't sound that good to others around on the road. What I don't like is when coasting like through a parking lot when it's in AFM - that's when I want the burble to come to life. But with gas prices they way they are, keep doing what you're doing 6.0! However if I need the burble, a quick tap into manual mode defeats AFM in all situations. Another thing that can get a bit annoying is if you are pushing the limit of AFM and it's doing the V4->V8->V4->V8 several times a minute. It pretty much comes down to learning to drive the car around it's little quirks. Once you do that, you will be smooth sailing with Magnaflow, Corsa, Borla, etc. This system does not DRONE much if any, and that's a big plus to me.

As for the overall sound of the system, everyone who has rode in my car has liked it. It's not annoying, but it has some sound to it. It's actually gotten a bit louder since the video was taken as the mufflers break in. I'm pleased, especially after getting rid of the stock intake. I dunno, but stock the car sounded like a Dyson Vacuum at WOT. It's a lot better now. :)

Can anyone tell me how good ( or rather how clost to a GT) will a magnaflow catback exhaust system will sound on the V6 G8?

Pop! Should've had a V8.:burnout:

Can anyone tell me how good ( or rather how clost to a GT) will a magnaflow catback exhaust system will sound on the V6 G8?

I've heard V6 mustangs (pushrod v6) with dual exhaust and there was absolutely no comparison between it and the V8s. That being said, I'm guessing there will be a few aftermarket exhausts that will (or already have) come out for the V6 G8s that will sound decent. A dohc V6 like the v6 in the G8 can sound decent provided you don't try to make it too loud. But it won't sound anywhere near a V8 tone. Think inline BMW 6 cylinder with the right exhaust/intake set-up and that's probably as good as it gets with the V6 as far as exhaust tone - and that's not too bad, I might add.

stock the car sounded like a Dyson Vacuum at WOT. It's a lot better now. :)

Totally agree! I can't believe how muffled this 6.0L v8 sounds! Reminds me a little of my fathers old 5.7L LT1-powered Caprice Classic!

Thanks for everyone's input - great descriptions and video/audio.

I've heard V6 mustangs (pushrod v6) with dual exhaust and there was absolutely no comparison between it and the V8s. That being said, I'm guessing there will be a few aftermarket exhausts that will (or already have) come out for the V6 G8s that will sound decent. A dohc V6 like the v6 in the G8 can sound decent provided you don't try to make it too loud. But it won't sound anywhere near a V8 tone. Think inline BMW 6 cylinder with the right exhaust/intake set-up and that's probably as good as it gets with the V6 as far as exhaust tone - and that's not too bad, I might add.

Our CTS V6 system sounds nearly the same as the G8 V6 prototype we made. Our website magnaflow.com has the V6 CTS sound clip for your review. Demand has been low for a V6 system which is why we have not pushed our prototype into production evaluation. If you are interested you may want to start another thread and see how many others are interested as well.

Our CTS V6 system sounds nearly the same as the G8 V6 prototype we made. Our website magnaflow.com has the V6 CTS sound clip for your review. Demand has been low for a V6 system which is why we have not pushed our prototype into production evaluation. If you are interested you may want to start another thread and see how many others are interested as well.


Couldn't find it on your site...

http://youtube.com/watch?v=X4_dRV2p_7o

http://youtube.com/watch?v=Cy1qcwrMLBI

So many of us have had this system for a while now. Is it just me or does it seem to be getting louder? I have roughly 600 miles on my system now and a fair amount of WOT. It sure does seem to be getting louder than the first day I installed it. I like it and this is a great sounding system. I'm done picking on the AFM noise, I've gotten used to it now.

So many of us have had this system for a while now. Is it just me or does it seem to be getting louder? I have roughly 600 miles on my system now and a fair amount of WOT. It sure does seem to be getting louder than the first day I installed it. I like it and this is a great sounding system. I'm done picking on the AFM noise, I've gotten used to it now.


They're supposed to get 30% louder over time... At least that's what Stolen Fox had said in the past. My motorcycles (with the same sound absorbing technology) get louder over time as well...:)

That's where flowmasters are nice. They never change. They may not perform as well but you know when you put them on they will be that way until they fail or you take them off.

That being said I can't wait to install my MF's...:wink2:

So many of us have had this system for a while now. Is it just me or does it seem to be getting louder? I have roughly 600 miles on my system now and a fair amount of WOT. It sure does seem to be getting louder than the first day I installed it. I like it and this is a great sounding system. I'm done picking on the AFM noise, I've gotten used to it now.

I must be deaf. I have not been able to tell a difference in the sound level since putting mine on. If anything, it seems quieter but that is probably me just getting use to it. Still sounds awesome. DOD doesn't bother me at all.

So what did the new cats flow at?

I have two designs which see a 90-110 cfm increase and am working on emissions gas conversion at the moment. More info to come as I wrap up the testing.

Thank you Oxidzr.

Can you let me know the muffler part numbers used in this system? Does it run resonators ? Is there any drone thoughout the rev range? Thanks

Can you let me know the muffler part numbers used in this system? Does it run resonators ? Is there any drone thoughout the rev range? Thanks

The G8 mufflers are of proprietarty design. We do not sell them as universals. One of the reasons our cat-back do not typically have mufflers that are "removable" is that these mufflers are in fact application specific.

If you look throughout the thread you will find pictures of the exhaust system. The only mufflers on the G8 standard kit are rear mounted 4x9x14 bodied. Our optional midpipe for more quiet operation consists of a dual in / dual out 4x9x11 body.

Oxidizr,
Is the only way to get the quiet system to buy the standard system and then buy the replacement section?

Ed I just Pmd U about this.

Just sent you a reply. Thanks for the input.

Oxidizr,
Is the only way to get the quiet system to buy the standard system and then buy the replacement section?

We may end up offering the complete quiet system and the replacement section however we are still looking at what works best.

I will definitely be keeping everyone in the loop.

Roger that. Thanks.
Ed

Magna Flo Parts available 08/01 for $1075.00

Which parts? What is the price for? The quiet system? The conversion parts to make the standard system quiet? It sound like the MSRP for a full cat-back?

Which parts? What is the price for? The quiet system? The conversion parts to make the standard system quiet? It sound like the MSRP for a full cat-back?

That is MSRP for our standard system.

Our "Street" quiet system will be released before the end of the month along with all the necessary details and pricing.

how did some of you guys get the exhaust for under $600 ? I see it for around 700-800 in most places i'm shopping at.

I would tell you but then I would be killed by the mods for telling people about non supported vendors.

Ok... here we go... call PFYC (a sponsor) and tell them that you have found a lower price on the exhaut shipped ($606) from a different vendor (hottexhaust)... tell them that you had a coupon code (fordtruck8) and that is how you got such a low price. Our supporting vendor price matches per thier policy and ships you the part.

You forever go forth and tell everyone how great and wonderful p71 is.

I went to Dublin once. I was on my way from TX to MI. Spent the night with some of my then wife's freinds. Washed and waxed the car. It started raining as soon as the layer of wax was on.

Is it out yet?


That is MSRP for our standard system.

Our "Street" quiet system will be released before the end of the month along with all the necessary details and pricing.

Is it out yet?

Samples and testing are completed for the "quiet" system now officially named the "Magnaflow Street Series."

16887 2008-2009 Pontiac G8 GT 6.0L Street Series Cat-back

Samples and testing are completed for the axle-back.

16883 2008-2009 Pontiac G8 GT 6.0L Axle-Back

Testing is finalizing for the Metallic 200 Cell Ultra-High flow Performance cats.

16429 2008-2009 Pontiac G8 GT 6.0L Driver's Side and Passenger's Side.

Pricing and additional information should be hitting our website at the end of this week and into next week.

Thanks!!

Samples and testing are completed for the "quiet" system now officially named the "Magnaflow Street Series."

16887 2008-2009 Pontiac G8 GT 6.0L Street Series Cat-back

Samples and testing are completed for the axle-back.

16883 2008-2009 Pontiac G8 GT 6.0L Axle-Back

Testing is finalizing for the Metallic 200 Cell Ultra-High flow Performance cats.

16429 2008-2009 Pontiac G8 GT 6.0L Driver's Side and Passenger's Side.

Pricing and additional information should be hitting our website at the end of this week and into next week.

And now the debate between JBA and Kooks shorties is re ignited.

Would the noise level of the "quiet system" be comparable to the
stock GTO exhaust ???




Samples and testing are completed for the "quiet" system now officially named the "Magnaflow Street Series."

16887 2008-2009 Pontiac G8 GT 6.0L Street Series Cat-back

Samples and testing are completed for the axle-back.

16883 2008-2009 Pontiac G8 GT 6.0L Axle-Back

Testing is finalizing for the Metallic 200 Cell Ultra-High flow Performance cats.

16429 2008-2009 Pontiac G8 GT 6.0L Driver's Side and Passenger's Side.

Pricing and additional information should be hitting our website at the end of this week and into next week.

Would the noise level of the "quiet system" be comparable to the
stock GTO exhaust ???

I'd like to see the numbers compared to the stock G8 exhaust.

The question for the lease "owners" is:

"Where and how much?" for the axle-backs?!

Oh, and of course, WHEN?!?!?!?!


Great news oxidizr!

I'd like to see the numbers compared to the stock G8 exhaust.

is post # 154 pg 8 what you want to see?

Oxidizer;

Can you elaborate on how the mid muffler will change the sound of the exhaust and possibly give us a clip? I think it was mentioned that the tone will change and not just volume?

I really don't want the exhaust quieter, in fact a bit louder and raw sounding would be OK with me. How-ever if the mid muffler changes the pitch enough to get rid of the drone/tone that I have at 75 to 80 mph and about 1800 rpm I might consider it.

To me at that rmp on the freeway all I hear is a single tone/drone rather than the pulsing v-8 rumble that you get when you are in the lower gears or with more load on the motor. Unfortunately, I don't care for the tone under cruising speeds (below 70 it's not an issue, but please don't just say slow down) I would like to find a way to change the pitch some.

I seem to be sensitive to drone or certain pitches. Perhaps it's because I do have a bit of hearing loss at certain frequency's and the ones I do hear normally seem to be accentuated. In any case your input on if the mid muffler will change the pitch or tone at the indicted rpm would be appreciated.

In the past with other cars, adding an additional muffler/resonator has made the exhaust quieter (not what I want) more muted so you cant hear the individual exhaust pulses as much (again not what I wanted), deeper in sound (not wanted) but did nothing for the drone that I wanted to get rid of. The last thing I want to do is chop up this nice system and make is less of what I want. (finding the right pipe length always seemed to solve the issue in the past, don't want to mess around with this one)

Strangely, the tone is only in v-8 mode and not with the afm engaged. Maybe because it rarely comes on above 70 so the rpms are lower and in the 4 banger mode the exhaust pulses are broken up enough that it doesn't sound like a solid tone.

The mufflers are still breaking in and seem to be getting a bit louder, cool. Love the sound under most all other conditions (especially under acceleration) and perhaps I'm just a bit too picky for my own good but............for some reason when cruising it just doesn't have the burble with the tone that is as pleasing as the rest of the package.

Thanks in advance for the info/suggestions. I'm not trying to crap on your system or give a bad review. I do like it a lot exept for that one bit (where I spend 90% of my driving time). The build quality was great and it went together with no problems what so ever!

You need to offer different tip choices too. I personally don't care for the quad tip look. I prefer two singles using the style tip you've got on the quiet system. That's the look I have on the Bonne.

I would tell you but then I would be killed by the mods for telling people about non supported vendors.

Ok... here we go... call PFYC (a sponsor) and tell them that you have found a lower price on the exhaut shipped ($606) from a different vendor (hottexhaust)... tell them that you had a coupon code (fordtruck8) and that is how you got such a low price. Our supporting vendor price matches per thier policy and ships you the part.

You forever go forth and tell everyone how great and wonderful p71 is.


If they're gonna match the price? Why should I order PFYC over hottexhaust? Anyone has had experience with either?

If they're gonna match the price? Why should I order PFYC over hottexhaust? Anyone has had experience with either?

Because their support helps us have this forum and the price is the same?

If they're gonna match the price? Why should I order PFYC over hottexhaust? Anyone has had experience with either?

Hott exhaust took over 2 weeks to get me mine. I know I was 1 of the 1st orders when they came out, but their customer service sucked!

okay..
the thing is I can't find PFYC phone number in their site...but seems fair to order from them, specially when it says: IN STOCK...

Hott exhaust took over 2 weeks to get me mine. I know I was 1 of the 1st orders when they came out, but their customer service sucked!

Mine took longer than that....

If they're gonna match the price? Why should I order PFYC over hottexhaust? Anyone has had experience with either?

Because if I told you to go with a non vendor y post will get deleted...

Ox,
Any news about the "quiet system". I don't see anything on your website.

Ox,
Any news about the "quiet system". I don't see anything on your website.

I'm curious as well. :)

Is anyone getting any vibrations through the floorboard and peddles while accelerating after the magna flow cat back install?

No, I don't get any vibration through the floorboard or peddles. If you have that you might want to take another look under the car the drone that I spoke of is not that significant to cause that.

None here on 2 different G8s

i dont like the tips on the magnaflow. I prefer the stock tips or even the tips i saw on the borla. little bigger, slash cut and angled

I'm curious as well. :)

+1!!

I just ordered the magnaflow catback from Hottexhaust hopefully they get their shipping times a little better for my order.

I'm having the same problem with my Magnaflow CatBack. I called Magnaflow and the person I talked to, Derrick, told me that most after markets will drone. He also said my Roto-Fab CAI is most likely causing it. He recommended I get the mid pipe muffler (PN: 12468) to tone it down. I also tried to PM Oxidizr to confirm this recommendation and he has not replied in a week.

Needless to say I ordered the mid pipe and will install this weekend. I'm not impressed by this $800+ system that is engineered for our cars. As for for customer service. When Derrick tells me initially you might try a resonator or another muffler, my confidence level goes way down.

All I know is that %^#$% drone around the 1700-2100 range hurts my wife's ears and should not be there at the cost of $800+ and then to be told "you should buy something else from us to fix it".

I have no choice. I have to fix it.

Thanks Magnaflow :rant:

My Magnaflow has none of these issues.

My Magnaflow has none of these issues.

Sound is subjective IMO. For one person it may be to loud and for another it may be to quiet.

If you DON'T want drone DON'T change the exhaust. I think Derrick is right. ALL A/M systems have it. Some are less than others.

FWIW if mine has a bit of drone... No biggie. I only paid 570 shipped for my M/F system which is an AWESOME deal as just two exhaust cans on my bike were over 700! :wink2:

I'm having the same problem with my Magnaflow CatBack. I called Magnaflow and the person I talked to, Derrick, told me that most after markets will drone. He also said my Roto-Fab CAI is most likely causing it. He recommended I get the mid pipe muffler (PN: 12468) to tone it down. I also tried to PM Oxidizr to confirm this recommendation and he has not replied in a week.

Needless to say I ordered the mid pipe and will install this weekend. I'm not impressed by this $800+ system that is engineered for our cars. As for for customer service. When Derrick tells me initially you might try a resonator or another muffler, my confidence level goes way down.

All I know is that %^#$% drone around the 1700-2100 range hurts my wife's ears and should not be there at the cost of $800+ and then to be told "you should buy something else from us to fix it".

I have no choice. I have to fix it.

Thanks Magnaflow :rant:

How loud could it be? The dBs as posted by MF/oxidizer show almost no increase in volume at cruise.

I'm not picking on you - I'm just trying to gain a measurement of your ear's sensitivity. How would you compare the drone in this car with previous cars you've owned/driven with aftermarket exhausts? My 2001 Mustang GT w/ catted H-pipe and aftermarket fm-design catback had a ton of drone, but I sorta liked it on that car. I don't want anything remotely like that on the G8 though!

Last question - is the drone only when the afm kicks in or is it just regular exhaust drone (ie, you get it in that specific rpm range even when accelerating?)

I personally wouldn't mind a little drone if it's just standard exhuast fare. What I'm a little hesitant of is the V4 AFM vibration/tonal difference I've only read about. I'd hate to have to listen to something that sounds horrible when you are cruising!

The resonance happens during low to moderate acceleration or if I'm cruising within the 1700-2100 RPM range. I barely notice the AFM. In fact I've set up my dashhawk background color to change so that I can monitor the AFM. I will frequently let off the gas for a moment until the color changes when I want to save some gas. As for the loudness it hurts my wife's ears and it annoys me, although I've been working around ships and jets for the past 18 years.

The drone is in v8 mode not with the afm active. I should have the Corsa DB's installed on Thrs. and will let you guys know if they make any difference. Ideally I would like the exhaust volume louder but with out the drone.

THanks guys - very helpful. I was concerned about some bad sounds kicking in when it was in V4 afm mode. Coming from a serious droner (the stang), I actually wouldn't mind a little drone.

I will have to check out the rpms when I'm cruising on the highway at 70-75 though. That's about the only time I got a little tired of the drone in my mustang.

Thanks again guys.

Hott exhaust took over 2 weeks to get me mine. I know I was 1 of the 1st orders when they came out, but their customer service sucked!

just an FYI on hottexhaust, my order for my maganflow shipped two days after I ordered.

Anyone have a sound clip or something of the drone? I'd like to do the exhaust mod, but if it annoys the crap out of me or my wife it's a little expensive to not worry about.

Well, after 2months wait from Summit, mine is on and I love it. Could be a little louder but that is how I like it. To me, there is no drown. You can barely here the switch from AFM to regular but that is even nice since I always forget to go into engineering mode. Good job Magnaflow. Had the old system off and new one on and rotated my tires in under an hour at my buddies shop!:)

Well, after 2months wait from Summit, mine is on and I love it. Could be a little louder but that is how I like it. To me, there is no drown. You can barely here the switch from AFM to regular but that is even nice since I always forget to go into engineering mode. Good job Magnaflow. Had the old system off and new one on and rotated my tires in under an hour at my buddies shop!:)

I drove one with the MF and at 70-75 mph cruising on the interstate it had drone, especially if you had an up-hill elevation change or want to increase speed slightly. Did you try it under these conditions?

I have driven it everywhere since I have had it on. Like I say, I tend to like louder exhausts so I guess it didnt bother me. Now of course you are going to hear it if you tend to go up hill a little since it is accelerating. If people want to here drown, go drive a Fox body Mustang with 2 chamber flowmasters with the 2k drown. BTw, that didnt even bother me, lol.

Thanks.

any updates on the magnaflow replacement cats?

any updates on the magnaflow replacement cats?

:mswerd:

are they making axelbacks ?

are they making axelbacks ?

From what oxidizr said earlier in this thread, yes, they have axle backs in the works.

any updates on the magnaflow replacement cats?

I emailed hottexhaust and they are looking into it. They called MF and they aren't available yet so pricing is TBD.

The part number is on the MF site though.

I want to keep manifolds because headers are nothing more than a throbbing PITA IMO and with the hiflow cats I think it'll give me a little more snap without sacrificing the quietness of the car. If it wasn't my daily driver I would think about the LTH. :)

Anyone running the axle backs? Does it help with the AFM issue? I just got my G8 GT and am trying to decide between the full cat-back and the axle back.

Thanks.

The video on here makes it sounds good. The one on the Magnaflow site makes it sound burbly.

ANyone install the Street series catback yet?

Anyone running the axle backs? Does it help with the AFM issue? I just got my G8 GT and am trying to decide between the full cat-back and the axle back.

Thanks.

What issue?

I have the full system and love it. If I don't want AFM to make noise I put it into the manual mode and it won't go into 4 banger mode but the 4 banger mode doesn't bother me at all. I see dollar signs when it goes into it. I love it! It comes out of it SO easy that it's not an issue.:)

Still waiting on mine :censored:

I bought the Magnaflow System and drove one weekend and took it off. The resonance was just too much. Had a Corsa on my Vette and that had no issues at all, just sweet exhaust tones. I took the MF off and it is currently collecting dust at the exhaust shop. Really interested in the Kooks, with my mufflers and with theirs. My question is why replace when I get the distinct feeling that there is not the big HP gain? I have heard from both sides of the aisle. Anyway would love to get the truth, the whole truth nothing but the truth before I invest $2800 for a Kooks. Thanks for your time

Keglo;

I don't have the kooks but have read from others here that it drones. If you didn't like the Magnaflow, don't get the Kooks.

Wait for the Corsa! Nuff said.

I just installed my Magnaflow system yesterday, and I have not the slightest clue what people are talking about when it comes to drone. Either I had a catback on my GTP that was loud as **** and I've come to ignore it, or it really is bad for some people?? I'm extremely glad I didn't get the street series.

Give it time to break in, you will notice it. Like many, it may not bother you though.

Sorry to revive a long and dead thread but this thread convinced me to order the 16795 exhaust system!

Thanks for all of the info above. The clips convinced me. I haven't decided where to order yet. Still shoppoing for the best $ so that means I have some time to convince the wife...

pardon my lack of knowledge but if we have the magnaflow catback x pipe exhaust with the 2.5" tips, is there any way to get 3" or 3.5" tips on the ends of the system? will that hamper the sound at all? if so, where could one find these tips? i am definately a noobie to tuning but saved up enough money and now its time to spend a little :)

hey guys!
I just installed my magnaflow 16883 Axle Back on my 08 Chevy Lumina SS and i love the sound of these babies ;)
But i notices that the tips are sticking out compared to the stockers :<

*Edit: lol sorry for reviving such an old thread lol i just noticed