I'd cut my losses and buy a honda if it were me. As for you i'd just look into a clean exhaust, dont just put a muffler on it. Do a whole exhaust. You may have to fab up a header. I don't know about those cars at all. But if your doing exhaust do it complete so its actually benificial rather than just the loud muffler. Then some suspension work and wheels, and you'll have a clean car.