I think you have a tech 4 under the hood correct? there are a few things you can do but it wont give you as much as your looking for and to get any significant boost you need to spend more money,,,you can always put some nitrous on her but that will shorten the piston life and a straight pipe will get you stopped and also be very hot and could cause a fire in your carpet and under your car where you park,,,go with a flowmaster or a cherry bomb type muffler.