advice on exhaust for my g8 please - Pontiac G8 Forum: G8 Forums - G8Board.com
Exhaust Tech Headers, Catbacks, Mufflers, lack of mufflers

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post #1 of 25 (permalink) Old 03-01-2016, 04:35 PM Thread Starter
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advice on exhaust for my g8 please

hello. i have a full stock 09 G8 GT. i am thinking about getting an exhaust system done and maybe a cold air intake. could you get some advice on these 3 options or maybe another option. thanks

1.G8 GT and GXP Mach Shorty Cat-Back (most aggressive kit)

2.G8 GT and GXP Mach Cat-Back (most popular mid-range aggressive kit)

3.G8 GT and GXP Axle-Back

price doesnt matter. thanks in advance.
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post #2 of 25 (permalink) Old 03-01-2016, 04:48 PM
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If you do a search on YouTube, you can listen to just about every combination you can think of. The solo axle backs have caught my ear and I think that's what I'm going to go with.

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post #3 of 25 (permalink) Old 03-01-2016, 07:43 PM
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I would listen to you tube videos first. Even the videos don't always tell the whole story. I like them LOUD!!!!!! I just put long tube headers on/no cats and no rear mufflers and figuring it would be crazy loud I took my x pipe off and put a jones mid muffler on and the car is still too damn quiet for my taste. To each his own though. If you like it loud I would look into headers, with/without cats maybe an x pipe and some solo's or SLP axle backs. I have heard Magnaflows and others can cause drone issues. Good luck sir.
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post #4 of 25 (permalink) Old 03-01-2016, 08:33 PM
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Yea. Videos only do so much justice. They may sound a little different in person.

Solo is very popular. If you go with a cat back and c.a.i. , you'll be borderline for a tune. Get headers and hfcs and you'll definitely need a tune. Also ,how loud do you want to get o.p?

Hey supersnake. Do you have a sound clip of yours? Interested to hear or at least get an idea as to how loud you are with your current set up

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post #5 of 25 (permalink) Old 03-02-2016, 07:11 AM
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Most important question, will you be keeping AFM? The louder the exhaust, the more annoying the changeover. Jpipes (Solo) fix drone, but not the AFM changeover. Corsa does a pretty good job with both.

2009 G8 GXP, #715 0f 1829 (#18 of 23 as optioned), MSM, 6M, Sunroof, Onyx/Red

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post #6 of 25 (permalink) Old 03-02-2016, 08:04 AM
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GXPaycheck makes an excellent point I fully agree with. The Youtube videos aren't going to give you a feel for what the AFM changeover will sound like. IMO, the GXP exhaust is about as loud as a normal person will be happy with if AFM is still in place. Disable AFM and you'll be able to go as loud as you want without the annoying AFM changeover sound.

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post #7 of 25 (permalink) Old 03-02-2016, 09:05 AM
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I have the Solo axle back and AFM turned off, big improvement over stock. You could start with this and work your way forward if you want more; if you completely replace the stock system first and find you don't like it, you're kinda stuck. Opinions on this approach may vary. Another option is to try and find a G8 group in your area (if there is one) and listen to different exhaust setups in person.

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post #8 of 25 (permalink) Old 03-02-2016, 11:04 AM
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No unfortunately I don't. I kind of suck at uploading pictures and videos . When you first fire it up its pretty loud and then it gets really tame maybe not much louder than stock while driving and when you put your foot in it it'll open up but it's just not what I'm use to.
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post #9 of 25 (permalink) Old 03-02-2016, 01:39 PM
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advice on exhaust for my g8 please

OP you can have fricken long loud headers, expand the noise using a 3 1/2" megaphone, 4" race cats, then straight through all the way back to X-pipe at rear (basically as loud and deep as possible), and still be free of unwanted harmonics. For bugger all.
I run custom tuned exhaust as above (see link in sig.) plus have AFM tuned to be active more often - zero drone.
The answer I found after much experimentation (Google pir4te AFM) is put X-pipe at tuned location of the second harmonic, and install HSV bimodal rear cans for $300. That is all.

Last edited by pir4te; 03-02-2016 at 02:06 PM. Reason: Go the first option, there are better solutions though.
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post #10 of 25 (permalink) Old 03-02-2016, 02:04 PM
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i went with solo axle backs. will be installing them shortly after they're delivered.

2009.5 Maverick silver G8 GT
Cunningham motor sports tuned
343HP 349TQ
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post #11 of 25 (permalink) Old 03-02-2016, 03:43 PM
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I vote for option 1. I'm running Solo's mach shorty catback along with mid length headers and I personally don't think it's loud enough. It's got a nice tone, but doesn't get LOUD unless you're getting on the throttle.

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2009 G8 GXP - Sport Red Metallic (#821 of 1829 / #33 of 74 as Optioned)
Roto-Fab Intake with Amsoil Dry Filter / HSRK / Kooks 1-7/8 Mids / SOLO Mach Shorty (Unbalanced) Catback / Pat G Tune / Norris Motorsports Gen2 Catch Can / BMR Swaybars / BMR Rear Trailing Arms / Tein S-Tech Springs / Koni Shocks & Struts / Whiteline Rear Cradle Bushings / Whiteline Strut Bushings /

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post #12 of 25 (permalink) Old 03-02-2016, 03:55 PM Thread Starter
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thanks for the responses. I am not wanting it super loud just want it louder than stock and feel like this sounds awesome for a V8. i am also on the edge of just keeping it stock because its my daily car and the louder exhaust may get annoying after months.
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post #13 of 25 (permalink) Old 03-02-2016, 04:13 PM
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Quote:
Originally Posted by kornfrk2727 View Post
thanks for the responses. I am not wanting it super loud just want it louder than stock and feel like this sounds awesome for a V8. i am also on the edge of just keeping it stock because its my daily car and the louder exhaust may get annoying after months.
That's what I thought to begin with also. I don't want it too loud I told myself. On my GT I started with just the axlebacks because they were alot cheaper than the catback. After a few months I wanted it louder. I proceeded to replace the mid muffler with an x-pipe. This held me over for a while and was relatively inexpensive. It had a great sound, but just wasn't loud enough. I wrecked my GT and got a GXP a few months later. This time I knew I wanted the catback and I got the loudest one that Solo offered. Even after Steve from Solo tried to talk me out of the Mach Shorty. He said it might be too loud also. I'm glad I got the Mach shorty it sounds great and even the wife approved. This lasted for about a year then I wanted more sound, so I bought mid length headers. With headers, the exhaust sounds AWESOME! Only thing now is I wish I would've got the long tubes for just that extra bit of volume. Oh well. My point is that it never ends. You'll get used to the volume of the exhaust after a while and think it's "too quiet" and you'll regret not getting the "louder" exhaust.

I'll also add that the Solo's are so good at cancelling drone that it's really quiet inside the car when you're just cruising. You get the best of both worlds - quiet inside & great sound for outside the car.

Terry Scott
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2009 G8 GXP - Sport Red Metallic (#821 of 1829 / #33 of 74 as Optioned)
Roto-Fab Intake with Amsoil Dry Filter / HSRK / Kooks 1-7/8 Mids / SOLO Mach Shorty (Unbalanced) Catback / Pat G Tune / Norris Motorsports Gen2 Catch Can / BMR Swaybars / BMR Rear Trailing Arms / Tein S-Tech Springs / Koni Shocks & Struts / Whiteline Rear Cradle Bushings / Whiteline Strut Bushings /

400 RWHP / 391 RWTQ
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post #14 of 25 (permalink) Old 03-02-2016, 04:20 PM Thread Starter
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the wife approved the mach shorty, i may end up getting that one. Steve told me axel back for noise but cheap and no HP. mach shorty is louder than the mach. ive heard many youtube videos and just wish i could hear the 3 in person lol.
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post #15 of 25 (permalink) Old 03-02-2016, 06:31 PM
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Just installed the solo axle backs. Beauty of a v8 sound. Not too loud but it rumbles

2009.5 Maverick silver G8 GT
Cunningham motor sports tuned
343HP 349TQ
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post #16 of 25 (permalink) Old 03-02-2016, 06:46 PM
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I picked up the Borla cat back from Maryland Speed love it. Then added SLP long tubes with the hi flow cats. Perfect daily manners and shows balls when needed.
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post #17 of 25 (permalink) Old 03-02-2016, 08:07 PM
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I have Solo high flow cats and a Borla cat back and am very pleased with it. I get lots of compliments on the sound, especially when I start it. There is a slight drone in the 1800 rpm range but it's not hard to keep it out of that area.

2009 G8 GXP #808 of 1829, #30 of 61 in this configuration: SRM, 6MT, Roof

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post #18 of 25 (permalink) Old 03-02-2016, 10:07 PM
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If any of you guys are in the Southeast you may want to come to the 6th Annual Southeast G8 Extravaganza at the end of April. There will be around 100 G8s and at least 50 different exhaust combinations for your listening pleasure.

https://www.g8board.com/forums/showthread.php?t=230969


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post #19 of 25 (permalink) Old 03-02-2016, 11:29 PM
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Quote:
Originally Posted by kornfrk2727 View Post
the wife approved the mach shorty, i may end up getting that one. Steve told me axel back for noise but cheap and no HP. mach shorty is louder than the mach. ive heard many youtube videos and just wish i could hear the 3 in person lol.
Have you considered the SLP Powerflo axleback. Really nice sound but not loud with stock exhaust. Steer away if you are going to go with headers in the future as when I put on the kooks headers and Xpipe they droned and I went back to the stock mufflers to eliminate, but it didn't do that with the stock exhaust.

Ken's 2009.1 Pontiac G8 GT Pacific Slate Metallic -Premium
Rotofab CAI, Kook's 1 3/4 LTs, HF Cats, 3" X-pipe, GXP Mufflers, PLX WB O2 & Aeroforce gauges
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post #20 of 25 (permalink) Old 03-02-2016, 11:42 PM
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Quote:
he edge of just keeping it stock because its my daily car and the louder exhaust may get annoying after months.
This was one of the reasons i went with cut outs. I can be loud or quiet. Not as quiet with the headers on but still pretty quite. It used to sound stock without the headers. Mine is quite loud and so i don't know if you want to go that route though. Not insane loud but loud : )

PBM GT W/SPORT PACK
GO:
Pat G tune
CIA: ORSSOM
EXHAUST: BADLANDZ CUT OUTS W/ X PIPE AND RESONATOR DELETE
KOOKS 1 7/8 mids and HFC's (coated)

SHOW:
PONTIAC EMBLEMS REMOVED. HOLDEN TRUNK LOGO ADDED.
TINT
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