guessing that this is just a "resistor" mod....
basically then engine bay gets hot, and the air sensor can read that the air is warmer(less dense). what this will do is make the engine think that the air is always cooler then it is, and while you may see a again... it will not be what they advertise...(far from it actually)
Perosnally I would not run this on one of my vehicles... nor would I ever suggest this mod to anyone I know...
Save you money, and put it towards something more worthwhile then a 10 cent diode in a 5 cent plastic case....