This is the part where we need to say, "your results may vary." Depending on the car and its current state of tune, you may get a large gain or a small one. Our Camaro was already running pretty good, so our gains were only a couple of horsepower. In addition, since the programmer was stacked on top of the K&N filter install, the law of diminishing returns came into effect. We're pretty sure that if we had done the programming on the stock air intake, the gains would have been larger. These numbers are corrected to SAE and not our standard, more generous STD factor.