Axle back exhaust ...
Retired & lovin' it!
Joined: Mar 2005
Posts: 4,474
Likes: 547
From: Jackson NJ
I'm presuming you don't have headers. If you were to replace all the pipes from the manifolds back with 3" (including the cats) then there would be some improvement to engine breathing. However, just changing out the back end to 3" won't yield much if anything. Best mod is to go with headers, X-pipe with hi-flow cats & then the hi-flow mufflers.
Melting Slicks
Joined: Jul 2011
Posts: 2,800
Likes: 166
2023 C6 of the Year Finalist - Modified
Mike when you're ready for a new exhaust or headers let me know I'd love to get you a discount code on my website. As others have stated, you'll get a marginal increase in flow and volume jumping up to a 3" axleback. The right exhaust will get you a better tone and/or more drone control. If horsepower gains is your focus, I'd look into getting headers first and foremost. I can help you with that too.
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,106
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
Then again, without a comprehensive plan to create additional power vs a different sound, the issue of power is moot.
