The pipe is supported at the head, by a friction fit, further down by a clamp
by the crankcase, and just near the end of the pipe by one last bracket.
I think the pipe is well supported. There is a bracket by the rear footpeg
mount that bolts to the back side of the muffler. I plan to "roll my own"
clamp to attach the muffler to the existing bracket. Should be just a simple
strap around the muffler. I'm sure the tractor muffler will weigh a LOT
less than the stock muffler, so I don't expect any trouble hanging
it. The dimensions of the muffler are almost ideal. The 2 1/2 inch long
inlet has an ID of 1 3/4 inches. The OD of the muffler is close to the OD
of the stock muffler. Overall length can be adjusted by trimming the 11 inch
tail pipe. And it's already painted flat black! Still haven't heard from the
manufacturer. Rather than await their call, after filling in an online
request, I think I'll call them Monday.