That's a neat concept, but I worry about the liability of having a customer install a gadget on top of their gas pedal. Wouldn't it be easier and safer to plug into a 12v and measure RPM via current fluctuations, the same way the SoundRacer does?
At the price point they sell in Europe, it's pretty cool having a 435HP natually asperated V8 instead of something smaller and turbo charged.
Like I said, they didn't acually make the gadget, they were just mocking the equivelently priced european sports cars. You can have a turbo four with the "gadget", or you can drive the real thing.