Bermuda,
I'm struggling with the logic but the fact is that in some places in Canada and the USA laws are now in place limiting how loud a streetbike can be. That didn't happen because too many people kept their stock pipe.
Don't get me wrong I like the sound of a loud pipe in the right place, and a loud snotty header was often one of my first mods. But now I think I'm further ahead changing gears nears redline without drawing attention to the fact.