I am surprised no one has said anything about the 8t drivers for this year either... Theres a video under "Lightweight Extrovert Drivers" window http://www.yamaha-motor.com/sport/products/modeltechnology/656/0/technology.aspx
New drivers are only good for a stock sled with stock track. Will have to change back to the 7 tooth if you want to run the 2.5. Or get a front cooler mod/delete.