Right right,what I ordered was just a "bolt-on",the mid-pipe on this bike(zzr600)has what they call a "pre-catalizer";I'd guess a form of a converter that,when you look inside the pipe it looks like its lined with a mesh screen,I'm goin to call the company soon,just lookin for the sound for right now,I really don't have the coin for every thing else...you know that list of goodies gets purdy long!The pipe should get here today... :yesnod: