I don't know if you folks have seen this before.. Beyond all the Supercharger, etc.. Check out the fuel tank!!!
It says V-Twin 250, Is that a stock tank for a Magna 250???
(http://i35.tinypic.com/2rcwz6f.jpg)
http://www.metalspeed.co.jp/magna_sc_e.html (http://www.metalspeed.co.jp/magna_sc_e.html)
A supercharged 250? H-m-m-m , should run about even with a 400 - 450.