Does anyone have a list of the brands of the bad quality silencers? I read the page a while back in MPH about the new ones the Spares Co. is making and how they dyno tested a few HP difference. I believe they also said something about a "crispness" to the sound. My bike runs pretty well, standard Rapide motor with concentrics with 160 mains at sea level. Plugs look good. It doesnt sound crisp tho, and i wouldn't mind a few more HP! My silencer has the name "Cambell's" on the underside of the silencer near where it meets the head pipe. Any info is appreciated thanks.