[Goose!]

Based on the way it is at my high school most of the stuff you do to your car is going to go un noticed. And most people really dont care.

So if your doing things for the sole purpose of impressing people I would do the following:

Window Tint
Dual Exhaust
Possibly a Cam
Smoked Headlights and Tail lights
Wheels

and see how much you have after all that.