I know that many people won't care what's done to the car, but what the hell :p I switched back to the stock exhaust with a catalytic converter. The car had no power at all, it was really properly loud, but no power. That and the fact that without a cat, the fine is $2500 or so..Also I gots me a new job at a doggy daycare ^..^ It is soooo much fun :3 I play with dogs, clean up when needed, and hang out the rest of the day :p I love it ^^