cold air kit, a cat-back system, 70mm throttle body if you dont plan on going too crazy with mods, or other wise 75mm, upper plenum, if you do alot of interstate driving get 3.55 gears or if you do more around town stop and go traffic do 3.73's (makes it perform better, not a pwer adder), im not a big fan of nitrous on stock motor (always heard not too good for stock plastic intake manifold.), programmer, underdrive pullys, intake manifold, heads stage 1 or 2 depends on what you want, cams. something to keep in mind though is to make sure your car is ready for what you want to do. say if you want to add a blower-you need to probly mod the rear end, suspension and deffinately brakes.