I had no chain rub on my first gen. They mounted the right side 1/2" lower. Although you could notice the difference if you really looked hard enough, I was happy with that. No chain rub with gen 2 either. I did knick the gen ones on a curve once. Right side. I like the looks of the gen 1 better but am satisfied with gen 2. Al little less deep and throaty sounding and a little raspier, but still good. Could just be the angle.