Hmmm, APC coming off, is it? I met a guy up here with an APC, he said it sounded like a lawn mower (kind of did). He really preferred the sound of mine -- a few said they thought it sounded like a Greddy. I think it's a Tenzo with custom piping -- "I think" because it was added by the guy before me. If you're going for performance, a hi-flow catback will be much better than just a muffler.