What do you have to spend? But preatty much what others have said. Obviously tune up, make sure car is up to date. Then if you want power, intake, headers, aeroforce, pully, wideband, tune. After that cam, pully drop, tune, intercooler, pully drop, tune, and so on. If you have 2g+ just turbo it. Keep in mind you will need a built trans shortly.