Get a decent header, or turbo, depends how much money and time you got, Low money and time and experience = Header, Lots of Money and Lots of time and Lots of experience = turbo also if you have the resources to get your car tuned you can get a better intake manifold and throttle body from blox, or skunk2, better fuel rails, better cams for higher revs better, the list goes on lol your only scratching the surface, if you have the resources to get your car tuned, you can replace just about everything you see with something better