If supercharging a 2stroke is to work, and work with significant power increases, as I have said dozens of times before, the sleeve intake and exhaust timing durations need to be very close to each other or the engine must have some sort of exhaust valve.

I possible means to accomplish this is to go with a movable exhaust gate (some companies call them a "valve") and this gate can either completely close to maximize the boosted charge going into the cylinder or to make the exhaust duration very close to that of the intake ports.

http://ezinearticles.com/?Snowmobile...sics&id=902728




As for these guys making such a supercharger, I will expect that they not only sell you the supercharger, but also a modded sleeve with the intakes and exhaust durations close to each other to get some benefit of the supercharging.
Why RB Innovations does not included modded sleeves to go with their superchargers, that is utter stupidity.