I'm going to repack my muffler on my 06 yz450 and i have one question. I found the answer relative to a yz426 but never clearly on the 450, are the rivets i drill out the ones closest to the pipe or cap? Then i assume you just remove the can, slide pack kit on, and seal with RTV and replace rivets. I'm going to use the Moose repack kit. Anyone have any luck replacing the rivets with sheet metal screws for convenience? Thanks for responses.