12. Although the NOS Super Power Shot nitrous kit comes with the hardware to mount the activation switches in the cockpit of the car, we chose to upgrade to a throttle-activated switch (PN 15640). This switch activates the nitrous system only when the carb is in the wide-open-throttle position. The switch is a great safety feature--if the throttle is backed off slightly, the nitrous system shuts off automatically. This thwarts backfires, lean conditions and so on. Plus, the switch increases dragstrip consistency because it activates at W.O.T. each time, not when the driver thinks the engine is at W.O.T. To install the switch, simply bolt it on the intake manifold in a position that allows the carb linkage to swing back and depress the switch at full throttle.