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It is not a chip, it is a SINGLE RESISTOR that you can buy at radioshack for 49 cents, mounted in a box to make you feel like you bought something. It tricks the computer by biasing the input for the air temp sensor. It is a bad joke, and I can not imagine the morals of the people who sell these things. They must be LTFAO after every sale.
A good clue: You can not highlight and search from their own website!

Dammit!!! Next your going to tell me the electric superchargers on ebay don't really work.
What about the tornado.... air restricter thingy??
Well, if it spins the air, dangnabit, it should spin the tires-makes sense to me!