If you really want to keep the car...Redo the air flow system. 4-2-1 header, cold air intake, and try getting a custom dual exhaust. (Not a Midas one). Then upgrade the throttle body and add a turbo or supercharger with 9-12psi boost. Don't forget the ECU, you'll need that to run your configurations. Then if you want then replace every body part (fenders, doors, hood, trunk, seats, wing, for carbon fiber parts.)Depends a lot on what you mean by sports car.