I'm not sure how this pipe company to bike brand thing got going either. It's obvious that some specific pipes will work better on certain models of bikes but I've seen enough charts from the mags to question the Muzzy for Kawasaki or Yosh for Suzuki rule of thumb.
From what I've heard (oooo, a pun

) Hindle's are all loud. Even their Stealth model is as noisy as some other brand's race model. Too bad because they are usually nice looking pieces of work.
The RS3 model of Yosh was reported to me by BK to be one of the quietest systems on the market, "almost legal" they said with a straight face :laughing From what I've heard just from running mine up in the back alley I agree with them. But the RS3 is discontinued

Did they keep the same sound level with their new Tri can design? Who knows.......
Too bad the Yosh's all come with a freakin' humoungous label on the side of the can.......