The V-Plus Volt Booster is designed to incresase your entire electrical system voltage approximately 2.2 volts above and beyond factory voltage. This unit is activated when you reach 70% throttle. This is when your whole vehicle'* electrical system is under the most amount of load. The result of the increased voltage is hotter spark, incresed fuel pump flow, etc.
The potential is there, I guess, but it seems awfully small to house a reliable transformer and whatnot to actually increase the voltage like they say. Just my opinion basedf on the info I could find, tho....