my motovan and parts canada catalogs have this thing listed in them, and describe them in the same way. i have not ordered or seen one, as i feel it is a waste of money. this product reads like it is a filters and rectifies dc power. this would keep the sine wave from spiking and above 0v. so apparently they are saying that if you rectify your dc power that everything will run smoother. i still dont think it is going to give you any noticable increases in performance