Nitrous Express 55040-12 4150 Gasoline RNC Nitrous System Kit with 12 lb Bottle

The Nitrous Express 55040-12 is a complete Restricted Nitrous Class (RNC) gasoline nitrous oxide injection system designed for the 4150-style carburetor flange. Built specifically for professional racers competing under RNC rules where jet size is regulated, this system is engineered to maximize nitrous flow density through any given jet size—delivering results that have to be experienced to be believed.

At the heart of this system is a CNC-machined billet nitrous plate featuring enlarged nitrous passages for optimized flow. Paired with a Lightning 250 nitrous solenoid with a .250" orifice, the system delivers an exceptionally dense liquid nitrous charge. The DF5 bottle valve with its large .500" orifice ensures unrestricted flow from the included 12 lb nitrous bottle, while the 8AN feed line connects the bottle to the system efficiently.

Key Features:

• CNC billet nitrous plate with enlarged nitrous passages for maximum flow density
• Lightning 250 nitrous solenoid with .250" orifice for precise nitrous delivery
• DF5 bottle valve with .500" orifice for unrestricted bottle flow
• 8AN nitrous feed line included
• Lightning series fuel solenoid for matched fuel delivery
• Stainless steel hard lines connecting solenoids to the nitrous plate
• Stainless steel bottle brackets for secure bottle mounting
• Heavy-duty relay and switches included
• Complete hardware kit: every nut, bolt, and electrical connector needed for installation
• 12 lb nitrous bottle included
• Fits 4150-style carburetor flange (Holley 4150 and compatible)

The RNC system's unique combination of a high-flow billet plate, oversized bottle valve, and large-orifice solenoid work together to keep nitrous in a dense liquid state all the way to the plate—a critical advantage when competing under jet-size restrictions. This is a complete, ready-to-install kit requiring no additional components for a full nitrous system installation.