Here's the situation, I want to get some mods that help my low to mid-end range. I'm not terribly concerned with high-end punch because I'm not going out on the track, not yet anyway, and I'm not going to be racing people past 120+ speeds. I want my car to be efficient where I need it to be the most, mainly in the 40-100mph range. Okay, so the two mods I'm definately planning on are a PR CAI and a Cattman Y-pipe. I want a cat-back system so my questions are: Which one should I go with? I've heard the Greddy is nice but a little loud, how about the Apex'i World Sport? Also, what kind of gains can I expect from putting on a RT hi-flow cat and a Courtesy B-pipe with the above config? Would it make that much difference? Thanx.

 

OK, the catback will not add gobs of power (5-8HP if your lucky) and they are all much louder then stock and pretty costly.

However, a SS catman y pipe will add a big chunk of power (15HP) and by itself will not make much noise. Plus, you'll still "look" stock" CAI was also a good mod.