Dyno Tech tested 6 Y pipes and The Crank Shop's Y pipe was the winner producing 3.3 hp & 3.7 lbs of torque at 100 rpms less then stock. Dyno testing late this past 2013 season we have found using the y-pipe, trail porting, and the Power Commander V (25-015) works very well @ 7800-7900 RPM's. The performance developments were slow because there were no fuel boxes available. The CDI box on the newer sleds will not allow any higher RPM's. We have an aftermarket coolant manifold that will remove the thermostat and it will help equalize the water flow better.