If your foot is on the brake then the ECU reduces the throttle making it hard to do burnouts without the truck moving. The burnout mod makes it so that the ECU can't tell that you have your foot on the brake while the brakes still work. There is a switch on the brake pedal that sends the signal. The mod puts a switch in the circuit so that the signal cannot get back to the ECU. A side effect is that if the switch is enabled then you can't take the truck out of park, which makes the mode a theft deterrent also.
(I have not done this mod)
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