I wish the cops would enforce whatever laws that are currently on the books for excessive noise around here (N. Central IL). Hogs outnumber any other make probably 10 to 1 and 99.9% of them are running non-stock exhausts. Some aren't bad, but the clowns with the shotgun pipes and other straight exhausts are just plain obnoxious.
Frankly, I don't know how they maintain any sort of hearing ability running those pipes and without helmets. I wear both my Shoei and foam plugs, AND I have the stock exhaust on my 12Ss. Maybe I'm turning into a old fart (at 42)[smirk], but I like a peaceful ride. I had a Jardine can with a DIY quiet insert on the bike and it was fun for about 5 minutes. On a long ride it just made my brain ache.
Besides, I'd rather not attract any additional attention to myself with a loud pipe since it's easy to be cruising along at fairly obscene speeds and not even realize it.