This Bikeman Performance y-pipe is the Ski-Doo 850's best bang for the buck! Easy bolt-on performance that really makes a difference and the horsepower per dollar is incredible. The best part about the Bikeman Performance 850 E-Tec y-pipe is that the longer you hold the throttle the better it performs. When the stock 850 E-Tec manifold starts losing power the Bikeman manifold continues to gain power, just check out our SuperFlow 902 dyno graph! We have spent countless hours in the R&D room, on the trails, and in the mountains riding to ensure this is the BEST y-pipe on the market.