I can't decide between the borla or the stillen catback system for my G35 coupe, does anyone know any differences in performance, sound, or look? Also, what kind of performance gain can I expect from a stillen intake, borla/stillen exhaust, and new racing belts?

 

Tons of posts, do a search. Personally I'm going for the Stillen, most HP gain and a nice growl. My dad has one on his FX35 and it's SWEET! Some people complain about it being to loud, but if its anything like my dad's its not bad at all. Good luck