4000ft is as low as you get around here and our normal bike riding is from 4-10k, there is a huge loss when you get up there past 7-8k. I am not saying I am going to follow a bike, more will the bike follow the sled in the tight trees, maybe not even follow but get to the same place without taking the way around route. Even at that there are some places it would kick azz around here because of really dense trees and technical riding, that is more what I would want it for, but since everyone is saying your sled wont follow I want to see that too. Like saying we start here, point A and want to go to point B without taking the back route and see how it goes down.
The the fun of a snow bike is being able to go places that a sled can't, and take creative lines rather than straight up the mountain. So will a snow bike follow a turboed 1000cc sled straight up a hill through the trees in 3' of powder? No. Can it get to the same places that you take a sled? Yes. Can it get there as fast or faster than your sled? Yes
Will a stock 450cc bike feel gutless at 11,000' compared to a turboed 800-1000cc sled? Yep. But it appears that you don't ride a stock sled, so why would you ride a stock bike?