I swear back in the day, late 80s, they were making them for the 2 stroke jet skis. Yep, i just googled it there were some, skidoo had one in 94. Found a snowmobile version, which means there might be more. http://www.youtube.com/watch?v=m9vsV3Sw_SA
do a search in performance/modified.. you can read about 100 threads explaining over and over why they dont work well at all.. they are possible, just suck and are near impossible to build compared to a turbo with no real positives.
Given that most snowmoblie 2 stroke crankshafts and bearings are on the verge of failure in stock form, I doubt the snout would be strong enough to run a decent S/C off of....
motor strength is the least of your worries.... backpressure is the name of the game with boosted 2 strokes... again, if interested. do a search and read to your hearts content