Im not sure of the increase in peak horsepower, i have heard the ez only gives something like 40 hp at peak, but that is at 2700 rpm. What is very impressive with the EZ, is the low end grunt, it really boosts the torque and response, you will be very happy. I would tell you 90% of the time i run on injectors and EZ alone, and the pm3 comp only gets turned on for fun.