Electric 'superchargers'will not provide boost on an automobile engine and will most likely rob a good running engine of high-RPM power by RESTRICTING airflow. Consider for a moment what a supercharger must do...
There are some folks selling "electric superchargers" that are pulling a fast scam. There are others that are legitimate. Sure, it is absolutely possible for an electric supercharger to work. If an axial flow...
well, don't. they are a joke. they don't work. they can't work. same deal with the "GAIN 20 HP WITH A RESISTOR" auction. those resistors are available from Radio Shack for 10 cents...they may work, they...