Not a WR, but still broken

The right header nut on my 1982 BMW R65LS is Fubar'ed, was really hard to take it off and now it wont screw back on, the thread on the cylinder is worn down. There is also evidence of exhaust blow past on the collar and pipe.

Looks like I'll be using my XT exclusively for a bit... Oh well, Cammy was needing a tune up anyways... Guess I'll just tag exhaust repair onto the bill... Oi...

Pictures coming soon.