It looks like a bike produced these to look vintage. Those pipes definitly dont look like they were dreamed up in the 30's..... Neat bike, Id spin her around the block.
The muffler is a variation on the "Brooklands Can", so named for it's required use at the famous British racing course in Brooklands-Woking, Surrey KT13, UK starting in the mid '20s.
There was certainly a lot of experimentation in that era, and I had heard of it but never expected to see it. It's good to see that it was as groundbreaking as rumor held. Too bad the economic climate precluded production -- who knows where motorcycle technology would be if it, and several Italian bikes of the same era, were available back then.
If it has already been done, it is safe to assume it is possible to do it.
On the other hand, if it has not been done never assume it is impossible to do it.
------- Rob --------