Okay, I'm not sure if this has been answered, but here goes. When you add a cell to a car, it automaticly pushes the 2.2motor, or whatever size beyond the posted rpm. Actually my 3.0 with a third cell is really pushin like 5.5. So, if a booster is running a slightly less resisted PCB, it could very likely push a bit harder than a non-boost car. (same motor same gears)