The NOS Dry BigShot kit is specifically designed to be used with an EFI system, such as the Holley HP or Dominator that can add the required fuel and adjust spark advance for a "Dry" type of nitrous system. The kit includes a billet 1/2" thick nitrous plate that mounts between a 4150 style flange throttle body and the intake manifold. A single stainless steel, 34-hole spray bar delivers nitrous to the engine. The kit also includes an NOS 18048RNOS Pro-Race Solenoid and jetting for power levels of 190, 225, 275, and 300 hp. Dry Bigshot Nitrous Kit For 4150 Type Throttle Body