I have an 09 YZ450f and so far am having one helluva time getting an aftermarket slip on to work on it. I've already had to return one pipe from a different manufacturer and now I purchased an FMF Q4. Everything bolts up fine except the stock exhaust clamp is too big to clamp down on the silencer and the header. Both of the inserts that FMF sent do not fit on my header and the pipe as itself slips right on. Am I a moron and overlooking something simple? I know the stock pipe has an insert that fits snugly over the header which gives the stock pipe a larger O.D. Has anyone else had this issue? Did you get another clamp and from where?