well, don't. they are a joke. they don't work. they can't work.

same deal with the "GAIN 20 HP WITH A RESISTOR" auction. those resistors are available from Radio Shack for 10 cents...they may work, they trick the engine into thinking it's always cold, thus causing the ECU to deliver a higher rate of fuel/air.

good luck. scammers are all over the place.