Oh yeah, snowmobiles are fun! They're all over the place up here, I personally have an older one, 2001 Skidoo Formula Deluxe 600 which is a 2-stroke. It's pretty quick but nothing like that. Those are 4 stroke Yamaha's, they have turbo kits for them and everything! Some run 170mph. Mine does about 105mph, that's quick enough for me! :D
http://i11.photobucket.com/albums/a1...Image00001.jpg
This is me doing a run up to around 90mph, speedo is in km/h. 80 = 50mph, 120 = 75mph, 140 is just shy of 90mph just to give you an idea. Looks like a turtle compared to the ones in the videos you posted. :lol:
http://i11.photobucket.com/albums/a1...h_100_0807.jpg