i had prostreets and a catted x and later a prochamber on my 03 gt, real gurgly freeflowing muffler. heard sound clips of a set on an 05 sounded mean as hell with the stock h, when i change my exhaust again, (twice on the 06 pypes violators and borla stingers, 9 different combos on my 03) im either going spintech or imco. i believe streetfire.net has clips google spintech axle back, youll find it eventually