I'm selling some of the extras off my 08' 800R. This is a slightly used RKT 14.6:1 pump gas head. Designed for 6000ft and up. I'm pretty sure this also works on all ski doo 800 motors, not just the 800R. Very good improvement over stock in the mid range and top end power. I was able to jet down from the stock 480's to 440's. This head greatly improve combustion efficieny. Head sells for $425 and I'm selling for $325.