i've seen theese things everywhere on ebay. All it is is a kit that shows u how to do some cheap mod. The kit says to get a resistor (less than $1 at radio shack), and tells u where to put it. I'm pretty sure it actually does work(less than 5 hp tho) but it usually requires premium fuel and will make ur check engine light go on. i would stay away from cheap crap like that.