All, Awhile back someone posted that they had tried the silencer off of a 250x and that it had fit. So I jumped on Ebay and snagged one in excellent condition for 50$. Last night I removed the extremely loud stock silencer and replaced it with the silencer I bought off Ebay. It does slide right on, same size as the head pipe. In fact moving front to back from the headpipe clamp the first bolt does line up perfectly with the hole drilled in the frame itself, so no problems there. The only piece that doesnt fit is the hangar off of the can itself, its off by a couple issues so I will have to either move that hanger or build a mod bracket to support the rear hangar. Shouldnt be tough at all. I will post the before and after pics when its done. But man what a huge difference in db's and tone that makes. Bike is not TTR quiet, but it is definitely a step change improvement. For 50$'s its a pretty nice SS silencer, usfs approved for noise and spark arrestor.