In my opinion, save your money. Intake/header/exhaust won't give much of a increase in performance and aren't worth the money (although they look much cleaner in an engine bay). Exhaust may also lead to tickets depending on where you live and what exhaust you get.

Save your money for maintanence costs down the road. Keep your car well maintained and it will last a long time.

If you must upgrade your car, I'd spend your money on suspension first. It will lower you some depending on what springs you go with, but it will make it more fun to drive.