"This setup will kill a nitro engine far quicker than pinching off the fuel line. In fact it is almost instantaneous." That works well on a plane. Kills the motor every time you put on the brakes on a car because it completely closes the throttle. The throttle stop keeps the carb from completely closing and killing the motor. Look at how a car or truck is set up. It's totally different than a plane setup. Brakes and throttle are on the same servo. Brakes on a plane use another servo. I know how the plane motor kill thing works. I have several planes. Car throttle linkage is different than plane because you have the brakes on the same servo.