I'm going to put my foot in my mouth probably but if It's built by Pro Systems for your application I am going to guess it will run a tenth better. Should have a little more top end and could even be more responsive because they tune and match the carb to your setup. Should be close out of the box if they did there part right. But you have to take into consideration if this is the only change made, track conditions, weather, is the truck going to hook the same, ect.