I have an 85 XR350 with the oem exhaust. The end of the pipe measures 3" across and the opening for the insert appears to be about 2" wide. Just bought it and it's LOUD!! Some parts are hard to find for these so I'm looking at what else might work. If someone with a late 80's 600 would measure theirs I would be grateful. Would a 600 from the 86+ years have the same size baffle? Thanks for any help!