OK, don't listen to people when they say..."cold air intake and exhaust are the first things you should do"...that is completely wrong.Your suspension is where you want to start first.Invest in a nice adjustable coil over kit (Tein makes a great setup for your RSX), then some strut bars and whatnot to stiffin the chassis up. After that, get a nice set of rims with some good tires and even some new rotors and brake pads...because going fast requires stopping fast too.Once you have a good suspension/brakes/rims and tires setup...then start getting into the engine, trans, and ecu.