Also, anything you do to help the air get in, and out more easily, will increase your gas mileage..
So an intake, and a set of headers will pay for themselves if you do lots of driving. Plus it will make the engine happier, and knock less.

Check out this thread, it will help you lots, if you decide to do anything to the car.

http://www.grandprixforums.net/safel...car-17482.html