Well, depends what kind of fast your talking about. If you just want to feel a little more pickup, and be able to beat most stock cars that arents over $15,000.. then go with things like a cat-back exhaust, headers, cold air intake, pulleys, cam gears, etc. If you want to be 11-13 second fast, build up your internals, and start saving for a good Turbo or Supercharger Setup.