I recently replaced a Moss muffler after only a few months of use. The muffler resonated loudly through the body (directly communicating with my left ear). The material was thin and seams were folded and compressed. I just changed to a Bell muffler, and it is superior. All seams are welded with high quality, and the exhaust note is through the tailpipe like its supposed to. Hopefully this note will save someone else the trouble and cost.