Put an Ice ripper track on my Yamaha Vector 2 years ago. It was like adding 5 HP with the weight reduction vs. the stock track with 96 studs. Really hooks up well and runs even with my RX-1 Warrior (tank) up to about 75 MPH in a drag race. Just ordered the Ice Attak XT for the RX-1 (136x15) to see if I can get it to hook up and come out of the hole better. I really like the track and have not anything negative about them. Try Tracks USA, Largest Dealer of Snowmobile Tracks and Parts
, they seem to have the best price & shipping deal.