NOS Pro Two-Stage Wet Nitrous System

The NOS Pro Two-Stage Wet Nitrous System is a competition-proven, professional-grade nitrous solution engineered for serious racers who demand precise, progressive power delivery from launch to the finish line. By dividing power output into two independent stages, this system directly addresses one of the most common challenges in nitrous racing — excessive wheel spin and traction loss from an overly aggressive initial hit — resulting in more consistent elapsed times and repeatable passes across a wide range of competition classes.

At the core of every system in this lineup is a Big Shot-style dual-stage aluminum injection plate featuring four precision spray bars with strategically positioned orifices engineered for superior atomization and uniform mixture distribution across all cylinders. As a wet-system design, nitrous oxide and supplemental fuel are injected simultaneously, maintaining a safe and consistent air/fuel ratio throughout the RPM range — protecting the engine while maximizing every horsepower gain.

Key Features:

• Dual-stage progressive power delivery — a controlled first-stage shot at launch preserves traction and vehicle stability, while the second stage unleashes full power through the mid-track and top end
• Wide horsepower adjustment range — tunable across a broad power window simply by swapping fuel and nitrous jets, with no major engine or system modifications required
• Big Shot-style aluminum injection plate — four precision spray bars deliver consistent nitrous flow, superior fuel atomization, and even mixture distribution to all cylinders
• Wet-system design — simultaneous nitrous oxide and supplemental fuel injection maintains the correct air/fuel ratio for engine-safe, reliable power gains
• Fully re-jettable — a wide selection of jet options allows fine-tuned horsepower calibration to match your engine build, track conditions, and racing class requirements
• Complete kit configurations — systems include a bottle, mounting brackets, injection plate, jets, solenoids, switches, wiring, stainless steel braided supply lines, fittings, and all necessary mounting hardware
• Multiple configurations available — carburetor flange options and bottle choices across the product line allow racers to select the ideal system for their specific application

NOS (Nitrous Oxide Systems) was founded in the late 1970s by two racers who perfected the use of nitrous oxide for automotive performance, quickly earning a reputation for producing easy-to-install kits built from the highest quality materials available. Today, as part of the Holley Performance family, NOS has powered more racers than any other nitrous brand — present at every major performance milestone in nitrous racing history, including the first 200 mph doorslammer run and the first 6-second pass.

Important: This system is designed for racing use only and is not legal for use on emissions-controlled or street-registered vehicles. Safe operation at higher power levels requires racing fuel, a compatible ignition system with timing control, and appropriate internal engine preparation. Select the variant that matches your carburetor flange configuration and bottle preference to ensure the correct system for your application.