The guts fell out of my muffler at the East Coast rally last year (funny story) It in no way gave me any more power but every one there swore I could better keep up with the wizzers. Honestly, went just as fast by the speedo. The noise is an annoying tinny whine. A wile back I took the guts out of another muffler and attached radiator hose and a lawn mower muffler. MAN! gave it a cool "thump, thump" sound. Really cool but I don't know if it could become flammable. Going to try it again with out the LM muffler and fill the end with chaw boy pot scrubber stuff. To much restriction lowers power.
Removing the guts won't do much good and only bother folks. But loud pipes save lives. (Read that here, but forget whom to give credit to)
Jez, thats cool!! Love the innovation.