Heres the scope...K&N Air Filter Is the best Intake mod you can do CHEAPLY, the Cold Air Intakes do the same think stock Air Box Intakes do, BUT CAI direct the air more smoothly, as for a main power gain, A porting of the Lower Intake Manifold will suffice nicely. My Friend is going to port mine soon, I dont have enough money yet, so Im going to slap on the stock throttle body on, and air box, and there will be a nice noticable gain of power...but to give you a list here goes...
-K&N Air Filter
-Cold Air Intake Kit(Mainly for looks)
-Porting of Lower Intake Manifold
-New EGR PLATE & 65-70mm Throttle Body(do searches for best ones, NOT Edelbrock or Mac, Niether BBK, try FMS)
-Nick