It depends on how much you wanna spend. If you want to spend small, i would getting an exaust or cat back exuast system and a cold air intake. But if you wanna spend a little bit more...i would suggest...Getting an engine swap, maybe from the Integra GS-R's B18 motor. Make it a stick shift. ;D Or give it a turbo, give it an aftermarket ECU chip, NOS etc. But to tell you the truth, it's an automatic so the tranny will not be able to take most of the extra added horses and such.