Newts pipes aren't loud. Not stock but not as loud as straight pipes. Ask Ed er biker. Or rather ask Pat. The Dinq could hear Ed's bike leave 5&20 and continue to hear Ed about all the way to Bloomfield! Now those are the pipes that are obnoxious. Them pipes are not a passing noise. And such is the fact of life when it comes to LOUD pipes. Most are straight pipes. All of our D&D's, sceptres, bubs, etc are semi baffled. These pipes can be operated in stealth mode too. Although arriving in stealth mode is a whole lot easier than leaving...
Okay, stealth mode on departure is more a matter of short shifting and low throttle, but still, motorsickles can be operated in a quiet mode. No? Have you never quieted your bike when approaching a horse, a mother with small child, an leo?
Loud pipes are not the problem. Obnoxious motorsickle operators are.
One cannot legislate behavior. That is why the legislation bans inanimate objects. Take away the cigarette, take away the firearm, take away the pipes, take away the knives. And you still have people blowing smoke, people being shot, people being offended by motorcyclists, and people being cut.
Nothing changes. Underlying behavior remains paramount.