I have never claimed to be a carb guru, but I manage to get mine to idle smooth, go on the brake with out hesitation, and keep the plugs clean. I have never changed calibration or boosters. there may be a lot left on the table I don't know. I am a bracket racer and never really tried to gain every .01 out of my cars. I concentrate more on making them consistent. which sometimes doesn't mean the fastest way down the track. but to gain 3 mph and .2 and still maintain that is something to think about. especially for a few hundred bucks. that would be the cheapest horsepower I have ever got. definitely something to think about.