I have those Emgo megaton mufflers on my 82 xs400 special, they look the same as the dimecity ones. I had to use exhaust tape as a gasket to make them fit on the stock headpipes. The sound is incredible, it is not to loud, nothing like a harley. Im happy because now cars can hear me coming in the blind spot. I think i should rejet or do some adjustment to the carbs though, but i cant hear any flat spots, and the bike does not feel like it lost power. This winter im planning to get a modern electronic ignition system, and KN filters, to see how much performance i can get. does anyone know of a good guide to tuning the bikes engine and carbs?