I've installed them in the tailpipe end of my Norman Hyde "Togas" and the noise reduction was about 30% in my estimation while also totally eliminating the resonance in my helmet from the mufflers. They are certainly way more effective at the end of the muffler than in the end of the headers. I had to use a piece of 1.5" OD tubing or electrical conduit about an inch long as a sleeve for the baffles to fit into. This worked perfectly and provided a nice snug fit into the ends of the tailpipes. The screw through the end of the tailpipe held them in place. I was extremely pleased with the results as the resonance from the mufflers was really beginning to annoy me and I actually enjoy riding the bike now much more than without the baffles. These are the baffles that Norman Hyde should include with their mufflers because their baffles make almost no difference.
J.C. Whitney Baffles
Bill
