I have posted this question in the past but I am hoping for some more advice/ experience before buying a 03-06 450 silencer for my 01 426. Who has done this with either a aftermarket or stock exhaust? The reason I want to do this is to use the shorter exhaust can that comes with the later models of bikes. My hope is that the 03-06 FMF Q4 will fit. It looks like FMF now offers the Q4 for the 426's but I don't know if it is just as long as the earlier model Q's for that bike. Anyone???