Well said Monte, I always tell people that when they buy a carburetor out of the box, it has a calibration that will be very generic and " safe" on most anything. You explain it a lot better than I can. On the three versus two circuit debate, I have shown guys around here that a three circuit properly tuned will make more mid range torque and accelerate harder on the track. The guys I have tuned them for see better shift recovery with the three circuit Dominator. Just my experience Keith