We put a full season of testing on this head and the results are in. 11hp gain over stock head running 91 octane fuel. I have these heads on stock 850's, turbo 850's, 912 Big Bore and 912 Big Bore turbo. Every one of my testers were thoroughly impressed with the performance gains. Powder Freaks was the first to design a head for the etec 800 and now we have the first 850 head. We spend countless hours testing on our in house dyno and out on the snow. We won't sell a product if we are not completely satisfied with the performance.
Manufacturer: Powder Freaks