$150 to spend

[Imagine]

Suspension should always be the first thing to get upgraded in my book. Forget wheels, tail lights, exhaust, etc. Better suspension makes the car look better, and handle better, which makes it faster in curves. Best mod money can buy hands down.

I've heard a lot of people say that just a rear sway bar alone really helped the handling characteristics. For $150 it's worth looking into, even if you have stock suspension.