Magnaflow 12468 or SOLO J-Pipes? - Pontiac G8 Forum: G8 Forums - G8Board.com
Exhaust Tech Headers, Catbacks, Mufflers, lack of mufflers

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post #1 of 23 (permalink) Old 01-11-2013, 04:29 PM Thread Starter
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Magnaflow 12468 or SOLO J-Pipes?

Currently I have the Magnaflow Street Series 16887 Catback. I didn't like the drone and volume of the mufflers that came with the catback so I switched them out for Dynomax Super Turbo mufflers. Things definitely improved but I still get a drone and vibration inside the cabin at low RPMs between 1000-1500 when cruising in higher gears. I still have stock manifolds and cats currently.

I was thinking of replacing the small mid muffler on the catback with the larger Magnaflow 12468 Tru-X muffler that was introduced by Pat G.

http://www.magnaflow.com/02product/d...rtnumber=12468

But since the Street Series catback already has an x-pipe near the cats would adding a second x-pipe via the Tru-X muffler cause issues flow wise?

I'm hoping this would be ok as I'm looking to reduce volume a little more and drone as well.

My last resort would be doing Solo j-pipes on the mufflers instead.

Any advice greatly appreciated.
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post #2 of 23 (permalink) Old 01-11-2013, 04:47 PM
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Hooker Maxflows.


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post #3 of 23 (permalink) Old 01-11-2013, 05:15 PM
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From what I've been reading on the forum if you already have a exhaust system and just want to reduce the drone then order some J pipes and have them installed on your current set up. I have magnaflows right now but I will be changing mine veerrrrryyyyy soon.

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post #4 of 23 (permalink) Old 01-11-2013, 05:52 PM Thread Starter
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Quote:
Originally Posted by lilhed View Post
From what I've been reading on the forum if you already have a exhaust system and just want to reduce the drone then order some J pipes and have them installed on your current set up. I have magnaflows right now but I will be changing mine veerrrrryyyyy soon.
I'm looking to reduce volume a bit and drone. J-Pipes only get rid of drone.
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post #5 of 23 (permalink) Old 01-11-2013, 06:06 PM
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Quote:
Originally Posted by pinhead66 View Post
I'm looking to reduce volume a bit and drone. J-Pipes only get rid of drone.
Reducing the volume? Hmm. They seem pretty low already but resonators should fix that. Resonators for the volume and j pipes for the drone.

2009 G8 GT Pacific Slate Metallic

14.4 with Rotofab, Magnaflow (10-12-2012)
13.2 with VCM, Pacesetters, Corsa, UDP, Diablo 93 Octane Tune (10-12-2013)
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319rwhp 324rwtq with VCM, Corsa, UDP. No Tune (9-1-2013)
335rwhp 341rwtq with VCM, Pacesetters, Corsa, UDP. No Tune(9-14-2013)
366rwhp 378rwtq ^^^ mods and Diablo Custom Tune (2-25-2014)
357RWHP 376RWTQ ^^^Manzo Tri-Ys (3-21-2015)(Hawaii)
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post #6 of 23 (permalink) Old 01-11-2013, 06:07 PM
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Quote:
Originally Posted by pinhead66 View Post
I'm looking to reduce volume a bit and drone. J-Pipes only get rid of drone.
But that Magnaflow muffler that you have in the link should work also.

2009 G8 GT Pacific Slate Metallic

14.4 with Rotofab, Magnaflow (10-12-2012)
13.2 with VCM, Pacesetters, Corsa, UDP, Diablo 93 Octane Tune (10-12-2013)
12.6 with ^^mods and Diablo Custom Tune (11-13-2013)
319rwhp 324rwtq with VCM, Corsa, UDP. No Tune (9-1-2013)
335rwhp 341rwtq with VCM, Pacesetters, Corsa, UDP. No Tune(9-14-2013)
366rwhp 378rwtq ^^^ mods and Diablo Custom Tune (2-25-2014)
357RWHP 376RWTQ ^^^Manzo Tri-Ys (3-21-2015)(Hawaii)
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post #7 of 23 (permalink) Old 01-11-2013, 06:30 PM
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How did you replace the mufflers ... cut and reweld? I have the 16887 also and it's not the typical axle back mounts.

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post #8 of 23 (permalink) Old 01-11-2013, 07:38 PM
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Or save yourself hundreds of dollars and slap on Hooker Maxflows to ELIMINATE DRONE COMPLETELY and still have nice rumble/scream at WOT.


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2014 SS "Houston Stock"

Rotofab
RCR Intake/RCR TB
LS7 MAF
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Pat G Tune


12.08@114.45 (stock tires suck)
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post #9 of 23 (permalink) Old 01-11-2013, 07:41 PM
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another option is the dynomax VT. Quiet idle, voice when you want it and no drone.

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post #10 of 23 (permalink) Old 01-11-2013, 08:02 PM Thread Starter
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Quote:
Originally Posted by PERM01 View Post
How did you replace the mufflers ... cut and reweld? I have the 16887 also and it's not the typical axle back mounts.
Yup cut and reweld.
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post #11 of 23 (permalink) Old 01-15-2013, 05:51 PM Thread Starter
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I've decided to go with the Magnaflow 12468 to replace the current mid muffler. After doing more research it seems to be the one that will quiet things down a bit and also eliminate some drone. Looks like having two x-pipes in the exhaust system should be no issue performance wise.

I'll report back after I get it installed which won't be for a while.
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post #12 of 23 (permalink) Old 01-15-2013, 07:06 PM
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Your exhaust will quiet significantly when your rpms rise to redline.


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2014 SS "Houston Stock"

Rotofab
RCR Intake/RCR TB
LS7 MAF
SW LTs-3" catted X
Corsa Mufflers
Pat G Tune


12.08@114.45 (stock tires suck)
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post #13 of 23 (permalink) Old 01-15-2013, 07:35 PM
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How does the Magnaflow sound at idle ?

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post #14 of 23 (permalink) Old 01-17-2013, 11:08 AM
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Quick
I did of my Magnaflow 16887 at idle with my Iphone

2009 G8GT - premium and sport package - PSM 1 - of 1063. Magnaflow catback 16887, Rotofab, VVME HID 6k, Cortex Rotofab 87 tuned, PPV-struts, Monroe front bearings, Folcik A-C controller + Pioneer ACH4000NEX Carplay

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post #15 of 23 (permalink) Old 01-17-2013, 12:24 PM
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Thanks Silvereagle,
Exactly what I was looking for, would like to get a system this spring that sounds a bit more aggressive at idle. Stock system sounds like a Cobalt until you jump on it. How bad is that freeway drone everybody is always talking about ?

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post #16 of 23 (permalink) Old 01-17-2013, 12:29 PM
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Quote:
Originally Posted by Transporter View Post
How bad is that freeway drone everybody is always talking about ?
It's a matter of opinion.

Nothing drones more than straight pipes out the back with no mufflers.
Made my damn eyeballs vibrate while driving....not good!

J-Pipes and Magnaflow 12468 are 2 added exhaust bits that can help lower or eliminate drone. I used the 12468 in place of the middle muffler, and have Pypes axlebacks....no drone



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post #17 of 23 (permalink) Old 01-17-2013, 12:31 PM
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It's kind of loud. I don't mind it too much but my wife complains about it ... especially if the windows are up.

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post #18 of 23 (permalink) Old 01-17-2013, 01:58 PM
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Not noticeable for me personally, but my wife complained about "too much engine noise" when driving up mountain passes in the 1800 rpm range in lowest gear. Otherwise daily driving to work, the sounds is lovely. I love my Magnaflow, the X-pipe config with the mid resonator gives it the slight exotic sound I like instead of the American V8 cam lope sound that some prefer (I think it sounds like an untuned engine with little refinement IMHO)

But to date this is the meanest sounding G8 I've heard


2009 G8GT - premium and sport package - PSM 1 - of 1063. Magnaflow catback 16887, Rotofab, VVME HID 6k, Cortex Rotofab 87 tuned, PPV-struts, Monroe front bearings, Folcik A-C controller + Pioneer ACH4000NEX Carplay

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post #19 of 23 (permalink) Old 01-19-2013, 09:03 PM
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Subscribing. I suppose if the Magnaflow 12468 is markedly better than the mid muffler, one could opt for the competition series catback (cheaper than the street series) and just weld in the 12468.
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post #20 of 23 (permalink) Old 01-29-2013, 04:54 PM Thread Starter
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Had the Magnaflow 12468 installed and it greatly reduced my drone at 1500 rpm and below in higher gears. I'm really glad I finally got this done.

Now that I look back, I pretty much wasted money on the Magnaflow catback as I've now replaced the mufflers and the mid resonator. If I had to do it again I should have kept the stock catback and just replaced the mufflers, the mid resonator, and put in an x-pipe. Would have been way cheaper.
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