107 vs 114. The 114 is maybe 10% better. My 114 street bob topped out at 115mph. Im sure the 107 isn't much different. If you are going to do anything past a stage 2 in the motor, buy a new compensator. My stock 114 at 2300 miles grenaded its compensator. Warranty covered it... But don't risk it if you're going to throw power at these m8 bikes. A torque cam, pipe, intake, GOOD tune. You're ready to rock.