don't listen to people saying about killing and replacing your integra.. I also have a integra and i recommend either a cold air intake or a short ram intake, it will increase maybe 5-10 HP at the most. Maybe you could get a bigger exhaust it will increase maybe 5 at the most. I think the short ram intake will do the most for $300 probably, also makes it sound a little better.. OR I just thought go buy a Import Tuner magazine and look (usually) in the back, "Supercharge any car $69.99).. that would increase probably 30-40 HP. That's all i can think of. Good Luck and keep that integra going.