We had a cool snowmobile here in town, I think it was called Rated R
Kawi dragbike motor, detuned a bit..1320ccI think, reversed head, Magnusen blower, 2 Hilborn injectors.. 750 hp on nitro.
It was a beast.. Built by CR Racing who built a few snowmobile racing engines, adding a third cylinder to a set of twin cased.. He dragraced them a lot on pavement.. Quick stuff.
IF I got the name right, there is youtube Videos of the Kawi powered sled. Rated R or 750 hp snowmobile.