I've seen some things that are unbelievable but this one truly takes the biscuit. Apparently you directly wire it to the battery, effectively shorting it. This gives you increased fuel efficiency, more torque, better power delivery.... the list of "advantages" is quite compelling, but complete and utter ballcocks. I've never heard anything so unreal in my life. At best it's just an empty box, at worse it'll sort your battery terminals and ruin your battery.
Let the ridicule and laughter commence....