Ski Doo 800r billet head with interchangeable dome inserts. Fits 07-12 800r ptec motors. This head adds 10hp over stock with 13.5:1 domes.(5000-8000') Other available domes: 12.5:1(low elevation) 12:1(turbo) 14:1 (high elevation 8000'+) 15:1 (race) Our billet heads will give you improved cooling capacity and better throttle response. We strive to produce top quality products that look great. Available in black, blue, or orange anodizing. Also available dome inserts for 830 and 860 bb motors.