I guess what they say is true, but here's the problem with what they are doing. When the car is cold, the ECU runs the fuel mixture extra rich. By tricking the car it's still cold out it selects a more rich fuel mapping. Running your car rich is better than lean, but the problem is your economy will majorly suck, carbon and deposit build ups will definatly form since it's not hot enough for all the fuel to burn at the required temp. Failed emission tests, basicly all the problems of running an engine rich. It would be cool to be able to rig it on and off so that when you want a fast run you can do it. Nifty idea though