We've had this head for 2 yrs now but I have not made it available until now. We were able to put some good test miles on last spring and are now happy with the results. This head requires an ecu reflash. I refuse to sell products that don't make significant perfomance gains. Dyno results show 7hp at peak and up to 13 hp in the midrange. On the snow this translates to 5.5gr more clutch weight and a gain of 3-4 mph track speed. Runs 91 octane fuel with no det mtn version only available at this time. 3000' + Ecu Reflash $550 CAD