ALright, so many things you can do, first off lighten the car up, back seats, unnecessary things, spare tire. Also lighter rims and tires. You could do cold air intake system or short ram intake, possibly some breather filters CHEAP but provide a better performance not huge but does do something. maybe radiator fan? hmm the list can go on. main thing though is colder air into the engine, also lighter weight. Oh and lay off the gas pedal to save gas lol dont redline from stop sign to stop sign lol
