One of the guys that is part of our snowmobile club runs a custom mountain machine, he got the big PSI motor, put a turbo on it and built the frame and tunel himself. He put on the M-10 suspension on the back and i think he went with polaris front suspension. I've never seen this thing go, but appearantly it climbs like nothing, he says that a belt lasts him two to three climbs. Just unreal, personally, if an 800 wont get me there, i probably shouldn't be goin there.