If your talking about turbo then, yes, they can. A turbo charged system can nearly double the HP over your stock setup, but it takes $$$ and quite a bit of prep-work to make it work, especially if you want it reliable. It takes very tricky clutching to get all of the power to the ground, and even then big CC engines with turbo blow (snap) belts quite easily. Aerocharger Turbo Systems makes a kit for snowmobiles. I would absolutely love to try it, but I would not put it on just a regular trail sled.