Join Date: Nov 2010
Location: Joliet, Illinois
has anyone tested the 3 different magnaflow cat back exhausts for the 6.0? any dyno numbers or complaints on exhaust tone? trying to decide between the 2.5 or 3inch exhaust and can get a really good deal on magnaflow. car already has slp headers on it.
I honestly doubt anyone has had all 3 versions of the same exhaust on their G8 here... not trying to be callus, just stating the truth.
Exhaust sound is very objective to each set of ears hearing it so what might be perfect in sound to one person may not be for the next.
Since your car already has the SLP headers you have the nice option to go with either the 2.5 or 3. Since those headers exit into a stock cat-back flange size I would say 2.5 would be just fine for your needs, depending on what those needs are with your car...You're probably not going to experience much difference in the way of actual power between either by feel or dyno numbers between the two.
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