Sorry D.F. didn't mean to get caught up in your thread so I'll just answer and go....Don't get me wrong, I love the sound of a nice V-twin/H.D. exhaust along with the "wing-ding" of my 2 strokes. I've owned H.D.s, other V-twins, with pipes, etc. in the past, and would again if I needed a long haul tour bike but...A lot of them/too many are obnoxiously LOUD. It's comparatively rare in my neighborhood/city that you'll "look up" to see/hear some "sportbike" screaming loudly (in high RPMs where they get obnoxious) compared to the V-twins. Both "sportbikes" and V-twins that do have the aftermarket exhausts, or louder "cans" usually have done other engine modifications that require them, in order to gain back the potential H.P. that OEM parts prevented but, the ratio of obnoxious noise favors the Twins 10:1 I bet. Why they want to make ALOT of noise is entirely their choice.