just got this exhaust installed today on my completely stock gta. the exhaust sounds amazing! i recommend it to anyone looking for an aftermarket exhaust.

Im looking into this system, did you notice a significant performance boost also?

ummm not really, maybe a few hp, but stock exhaust is 2.75 compared to this 3 inch so it cant be much of a difference

ic, well i also got the restrictive stock lg4 exhaust so...

i just had a custom exhaust made for my car with a the cat removed and a 3" intermediate into an american thunder flowmaster thats 3"in and dual 2.5" out with hooker 3" exit tips. The car sounds great. A little raspy without the cat though(Im thinking of putting in a moroso spiral flow muffler where the cat was to lose some of the raspiness) but i dropped 4 tenths off my time with just the exhast. Bone stock the best she could do was a 15.84 at 84 with a 2.1 60' and after the exhaust i ran a 15.40 at 89 with consistent 2.0 60'. the 60' tme could be better but my posi clutch packs are shot and im not hookin up with both tires.

mine seemed to pick up performance just abit.. it was hard to tell, i never got any dyno numbers or track times. the headers did make a bigger difference.

i thought stock exhaust was 2.5inch? oh well, the 3inch smooth bent pipes will flow better. the muffler itself might be only abit better than the stocker but it does sound better.

my lg4 had true duals; 2 1/4 inch