As soon as I read your post, I thought of this bike:
Custom SV650 - Cycle World Show Winner - The Kneeslider
I met and talked to the builder at a recent trackday in NJ, because I had to know more about the incredible machine that lined up next to me on the track!! I had no idea what it was until I saw it loaded on a trailer and talked to him. I love the exhaust...maybe you can contact him for info.
This would be sweet on a streetfighter- IMHO
