Well, I'm not sure there was much interest in this when I first posted, but I figured I would updated it anyway. I bought a set of Tec -2-1 pipes for Bonne/Thrux & went to work.
1] Stock Bonnie head pipes would probably fit okay - These were more work.
2] The down tubes on the AM/SM are a little wider than the Bonnie. Adding the tabs for the forward controls, this 2-1 pipe had to fit a little wider than it was designed. As a result, the position where they are lined up to accept the collector changes. I had to cut 1/2 off the end of the right pipe so they would be in alignment at the collector.
3] I also had to put a slight indentation in the right pipe to clear the edge of the engine. Not doing this would have required the collector be aligned at a slight downward angle, and I wanted it straight.
4] The bracket for the collector lines up at the end of the down tube, so it is not difficult to fabricate a clamp and attach it to the frame rail.
5] Rear bracket mount is about 4" behind and slightly above the AM/SM stock bracket. I fabbed an aluminum bar mounting it to where the factory foot peg plates originally mounted.
6] It was more work than I expected. It looks better than the picture below shows it to. I'll post more (better) pics this week of the brackets.
7] Now to create some mid-pegs and controls so I can ride it.