@ Lost Rider, I know perfectly what forces are exercised on the fixing point of the exhaust (I changed my exhaust myself) and i know how strong the OEM fixing point is since i had a car destroying my exhaust from behind.
There is no difference between the R1200R and the nine-T in that matter.
There's not only the weight of the exhaust, but much more the vibrations and the side movements that are not contained.
Nevertheless, I like what Dave made. But since he seems to be very talented, he's probably capable to improve his concept.
2nd that, great work Dave it does look very nice. There is a good deal of stress on the exhaust if it isn't supported correctly though. I am not saying it will break, because honestly I don't know, but it's enough of a possibility that I would not run something like this on my bike. With this setup, the heating and cooling of the metal as well as the vibration and shock from bumps will likely cause more metal fatigue over time than usual. The bracket itself could break, but with only 2 mounting points it probably won't. Instead in will slowly pivot downward putting stress on the weld just before the Y splitter of the muffler. The weld itself won't crack if it's a good one, but the pipe will, right at the edge of the weld. (A good weld is generally stronger than the base metal)
On a car or truck the exhaust is mounted using rubber hangers. This allows a relatively long length of pipe a moderate amount of movement. The pipe flexes as it bounces around, and shares these stresses over the entire length. If an exhaust hanger were to be removed from the system it would allow the system to move too much and break at the most rigid point.
On a motorcycle the exhaust system is much shorter and more rigid. To allow it to move causes a significant amount of stress over a small area. This is why they are not mounted with rubber hangers.
Like Tracteur said, triangle! I'd rather not have to pay for a new pipe.
Will it break? I don't know! But if it does you'll know why!
There's another 2 cents from an internet engineer ( nationally certified welding inspector with a degree in manufacturing) who hasn't seen the NineT in person yet.