Join Date: Nov 2010
Location: Joliet, Illinois
The stock mufflers do well to quiet things down, especially with a full header and midpipe like you currently have. Adding GXP axle-backs would wake things up quite a bit for you, and I'm sure the OBX axle-backs would do nicely if you wanted more sound on a budget. But as far as extra power is concerned, mufflers don't make much of a difference on the butt-dyno.
2008 White Hot GT w/ Premium Pkg. 185k miles and counting!
Blueline Performance DoD delete deluxe pkg w/ "The Probationary" Cam, Pypes Headers, Spectre Intake, ZL1 fuel pump
Tuned by Bob at Next Gen Built Performance