Well I'm running a set on my traveling bike and at cruise they are very quiet with a nice civilized growl on accel. They are of complete Stainless construction and seem well built. Almost identical in noise level to the short TOR slashcuts they replaced, evidently they flow better than TOR s as I had to jet to 130 s and I'm still a froghair lean. Evidently they aren't that popular or more folks would be running them. Surprised to learn that.
