exhaust
Longtubes + Cats + GMMG = Better
Heads/Cam + LTs + Cats + GMMG =
Longtubes + ORY + GMMG = A bit raspy but loud
It all depends on the route you go with your car and how much coin you want to drop on parts. Lowering your car? Stick with a Y-pipe setup IMO. Not saying *SOME* (<--- read SOME) true duals can't have good clearence, but most that I have seen hang a bit low for lowered cars.
Search http://www.ls1sounds.com and http://lsx.streetfire.net for some sound clips of both setups.
Plus I have read on here that it outperforms some catbacks by as much as 15 hp at the wheels.



