The system replaces the booster and makes use of the power steering pump for its power. I guess used for space limitations and or cars with big cams that have little vacume to spare.
My friend needs something like this as his valve cover hits the booster with the new heads he has. (non Mopar car). Just wondering if anyone here has used the system on a muscle car? In fact I am cutting a rocker off a Suburban today and it has the factory version of this system on it. So I guess it works well with a stock vehicle.