Now I don’t know if this will work, but logically it should. The ECU should be reading slight voltage changes from you're speed sensor using that to calculate your speed. Once it reaches the predetermined threshold, the speed limiter kicks in and the car falls flat on its face. The trick here is to fool your ECU into thinking its still moving so you stay out of limp mode. There may be a way to wire in a resistor in that circuit to change the voltage the ECU reads thus keeping the signal but tricking the ECU. So in a nut shell, you're going 120mph but the ecu still thinks your going 35.