I used the ding king from Pep Boys on my aftermarket sport bike exhaust that had a ding. It worked. It still has some scratches though. Of course, you can see the sport bike exhuast. If it was on a car, i would have cared less. Not to many people climb up under your car and say, oh, look at that ugly ding on his exhaust. But if it's a bad dent that restricts flow, you may be better off just getting a new exhaust.