Factory Exhaust - Explained - Page 2 - Pontiac G8 Forum: G8 Forums - G8Board.com
Exhaust Tech Headers, Catbacks, Mufflers, lack of mufflers

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post #21 of 26 (permalink) Old 09-12-2013, 09:23 PM
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Awesome read, but I gotta ask who was crazy enough to peel open a GXP axleback???
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post #22 of 26 (permalink) Old 09-12-2013, 09:32 PM
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Good write up. Kind of saves me from spending money on a solo exhaust.
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post #23 of 26 (permalink) Old 04-13-2014, 06:46 PM
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My g8 has a flutter that you can feel in the steering wheel and the seat of your pants. It happens when the car is not using much power and a slight push or let off of the gas pedal will make it go way. The dealership says it is the exhaust and there is nothing I or they can do. Any one with a fix would be greatly appreciated. Thanks
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post #24 of 26 (permalink) Old 04-13-2014, 07:04 PM
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Quote:
Originally Posted by T.R.ash View Post
My g8 has a flutter that you can feel in the steering wheel and the seat of your pants. It happens when the car is not using much power and a slight push or let off of the gas pedal will make it go way. The dealership says it is the exhaust and there is nothing I or they can do. Any one with a fix would be greatly appreciated. Thanks
From the conditions that you describe this "fluttering" occurring and the fact that it stops with throttle input my guess is you are feeling vibration from the AFM kicking in. There are several threads on this issue if you do a quick search. It is considered normal, but if it bothers you there are updated motor mounts that will greatly reduce the vibration you feel.
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post #25 of 26 (permalink) Old 04-14-2014, 01:10 PM
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Remember, kids.....for a Helmholtz chamber to have any effect and affect the frequency elimination process, it must have one capped end; otherwise it's just another pipe.

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post #26 of 26 (permalink) Old 05-13-2016, 01:59 PM
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And the real performance benefit comes from the fact that the stock muffler weighs 24 pounds. A muffler-eliminating j-pipe system weighs 8 pounds.


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