I own a 97 Grand Prix that has 200 horse right now that I'm making into a fast and furious car. I already know I'm putting in a cold air intake which increase gas mileage and horse power by 15 hp. that puts me around 215hp. Can anyone share some other methods of getting cheap hp. I'm also getting a high flow exhaust which adds a little bit more. I'm looking to get around 300-350 hp.