Features include increased rev limiters for better propping options; increased fuel and spark curve for more power gains through the power range; and easy installation. The upgrade works with digital or conventional shift and throttle systems, and custom calibrations are available. Go with the Stage 1 upgrade for $795 and you’ll pick up 55 hp and 15 foot-pounds of torque as well as an increased rpm limit up to 5,400, plus a boost in torque. Pay $895 for the Stage 2 upgrade and you’ll pick up 85 hp and 50 foot-pounds of torque. You’ll get the most out of the motor if you run 91 octane.