I'm planing on gettig a stillen y-pipe, but i was wondering if it is one of those mod's that works best in conjunction with something else. For instance I'm getting a Stillen Hiflow intake and a Stillen Y-pipe, but don't plan on getting an exhaust. Would this be wise of me or does the addition of the exhaust actually increase my cars performance?

 

Oh yeah. You should feel a pretty good difference w/ a Y and intake(which everone you choose). W/ that good 2k muffler design, I would actually look at modding the the cat back last if anything. The stock catback and muffler will help keep things quieter.

 

i have stillen hi-flow and still y-pipe..
it's pretty good power gain just by using those two..
i want to put on a cat-back exhaust later...hope it will yield even more power...