Running at 110 Hp on a 1200 lb machine you would not feel a 10 Hp drop in HP. Dyno proved it. And I Agree. There is no noise in front of an on coming loud motorcycle. I will keep mine quiet. There is more to it than just changing the mufflers. Once you screw with back pressure u have to fool with input. ( jetting or mapping. ) you could end up needing a valve job sooner than if you left it alone.