well
depends on ure budget.. but heres a list of what u can do to the engine
2.5 inch headers for the engine, 2.5" downpiping and a muffler if u want sound.
a cold air intake, some good iridium or platinum plugs, nice 7mm plug wires. that ought to get u started but if have the distibutorless ignition system u cannot get the wires for that...