Often times, the application of too much nitrous at the starting line can ruin a good launch. NOS Dual Stage Big Shot nitrous systems are designed with this in mind. They inject nitrous oxide into your engine in two stages. The first stage allows you to leave the line with a moderate nitrous boost of up to 200 HP. Then, with the tires fully hooked up, the second stage is activated for a power boost of up to 400 HP! The first stage is turned on by a throttle-activated microswitch, while the second stage is activated with a push-button switch. Systems include two Cheater solenoids for the first stage, one Super Pro Shot and one Cheater nitrous solenoid for the second stage, an unfilled nitrous bottle, a 1/2 in. injector plate, filters, fittings, a variety of power jets, switches, aircraft-quality stainless-steel braided hose, and all other necessary hardware for a complete installation. Also available without the bottle. Racing fuel and racing ignition system with timing control are required. Not recommended for intake manifolds with a separate inlet for each carburetor throttle bore, except for 3x2-barrel setups.