[P.S.]

One of the local "gurus" told me that the steel mufflers are quieter than the stainless ones from Aries. Since I was after quiet, I chose the black steel version. It really is super quiet. The stainless requires the clamp with the cloth inside it to allow for the extra expansion of the stainless material. If you don't use the special clamp, it fractures at the weld joint behind the tapered chamber.