of course the engine needs to be richened in order for it to work effectively, but i think you guys are judging too hard without any solid experience with the product. Its not perfect, but RB is on to something, and I think their rc supercharger is worth the money for many reasons, gains in power if the unit is set up properly, and of course, the cool factor, having a functional supercharger on an r/c vehicle, but thats just the opinion of a total gearhead, I.E, myself