RE: supercharger
The impeller on the back of the Hyper .21 is not a turbo or a supercharger of any kind. It's purpose is to atomize the fuel for a better burn, which gives it a bit more power. Because of the way these things make power, a supercharger or turbo, just won't work on a 2 stroke motor.
OS is coming out with a 4 stroke .21 car engine. A supercharger can in theory work with that engine.