Damn dood do some research! Besides first of all decide what road your planning on taking.
1. NA - I/h/e/p cams. pistons etc
2. FI - Turbo or supercharger
3 N20
Body Kits
1. Aggresive
2. Clean Oem Look.
So many products out there, and its all up to your taste. Next thing you're gonna ask is which brand name of prudicts to use. Well DO SOME RESEARCH!!!
Invest some time in your project.