I didn't test ride it with just the silencer and then with the wrap. Revving the engine with just the silencer the difference was noticeable. After wrapping the pipe it was more noticeable. Not nearly the amount of pipe noise associated with 2 stroke pipes. I assume the wrap has changed the sound wave characteristics. I haven't done much with the quad since this was all done. Its mainly an ice only quad. So I'm gonna have to wait a month or two to do some real testing. Hopefully by Thanksgiving some local ponds will be frozen.