Cat-backs on the C6 vettes did nothing for power only sound. The camaro stock exhaust could be more restrictive. I would have to wait till somebody did a comparison on a dyno. My thoughts for now is just do a cam with headers, electric cutouts with stock mufflers. Headers w/hiflow cats and deleting the resonators should increase the sound.
07 Trailblazer SS
13:60 @ 102 mph.