I get ready to attach the FMF silencer that was on the bike when it was bought, and it doesn't fit very well. It slips off the stock head pipe. Looked at the rubber connector boot, and I think it held the two exhaust pieces together. I adjusted all the mounts, and still won't fit. The silencer only slips on about a centimeter. I wonder if a FMF head pipe would solve the problem, or if I need to get a full exhaust.