Swapping pinion gears on site is easier than dealing with water pumps, radiators, tanks ECT. It takes 1 minuet to swap gears simple as that....... besides with all the blow overs you see all over youtube do not you think water in lipo powered car is a bad idea?!!? if your hose's ever come loose, your pump cracks, or your reserve tank cracks.............things will not be pretty.