Headers, delete cat if you have no emissions tests otherwise get a high-flow, a nice 3" mandrel bent catback (4th gen LT1 catbacks can bolt right up to your third gen, it's the same setup)... what's the induction on your car? Get some type of cold air intake or if it's TBI or carb i guess oen of them high flow air cleaners... if you wanna spend a little more, a limited slip diffeential with 3.42 or 3.73 (or 4.10 if you're feelign ballsy
) gears would be nice