No little box is going to stabilze the voltage to any significant amount particular SOOO far from the load. The best way to try to stabilze the system is as close to the load as possible. Near the fuse box is as far from any load as you can get.I understand how the electrical system in a car works. The purpose of the Hyper-Voltage kit is to provide a constant voltage to the car's electrical system (after the battery). Put a voltmeter on a car battery while the car is running. The voltage isn't constant. The car stereo world has been using voltage stabilizers to provide a constant 14.4V to amplifiers for years. I think the Hyper-Voltage system is basically the same device, but it's being used for the whole car's electrical system. As I said before, I haven't tested one, so whether or not this provides any benefit is to me unknown.