Nitrous Express 30040-10 Stage 6 Holley 4150 Carb Plate Nitrous Kit 50-300 WHP

Vehicle Fitment

• Universal - Compatible with any gasoline-fueled carbureted engine equipped with a Holley 4150-style square bore 4-barrel carburetor

Fitment Notes

• Designed for Holley 4150 square bore 4-barrel carburetor flange only - does not fit Holley 4500 Dominator or spread bore carburetors
• Gasoline applications only - not compatible with E85 or alcohol fuels (see PN 30045-10 for alcohol version)
• Race fuel recommended for power levels above 150 HP
• Not CARB approved - not legal for street use in California

Features

• Phase 3 Spraybarless billet aluminum plate delivers superior nitrous and fuel atomization with no spray bars to sag, split, or restrict airflow
• CNC-machined center divider discharges nitrous and fuel simultaneously for even cylinder-to-cylinder distribution
• Six graduated power levels - 50, 100, 150, 200, 250, and 300 WHP - included in a single kit for maximum tuning flexibility
• Lightning Series solenoids included with limited lifetime warranty for long-term reliability
• Heavy-duty 40-amp relay included for safe and reliable electrical activation
• Extra-long 15-foot stainless steel braided supply line for flexible bottle placement
• WOT microswitch activation ensures nitrous only fires at full throttle
• Made in the USA by Nitrous Express in Wichita Falls, Texas

Specifications

• Part Number: 30040-10
• System Type: Wet Conventional Plate Nitrous System (Stage 6)
• Carburetor Flange: Holley 4150 Square Bore 4-Barrel
• Fuel Type: Gasoline
• Power Range: 50-300 WHP (6 jet sizes included: 50, 100, 150, 200, 250, 300)
• Stage: Single
• Plate Material: Billet Aluminum (Phase 3 Spraybarless)
• Solenoid Type: Lightning Series (Billet Aluminum and Carbon Fiber)
• Relay: Heavy-Duty 40-Amp
• Bottle Capacity: 10 lb
• Bottle Color: White (powder-coated)
• Bottle Valve: Lightning 45 Billet Aluminum
• Supply Line Length: 15 feet (stainless steel braided)
• Activation: WOT Microswitch

Included Components

• 1x Phase 3 Spraybarless billet aluminum nitrous plate (Holley 4150 flange)
• 1x Set of Lightning Series billet aluminum and carbon fiber solenoids
• 1x Heavy-duty 40-amp relay and wiring harness
• 1x WOT microswitch
• 1x 15-foot stainless steel braided supply line
• 1x 10 lb white powder-coated nitrous bottle with Lightning 45 billet aluminum bottle valve
• 1x Stainless steel bottle bracket set
• 1x Six-level jet set (50-300 WHP)
• 1x Complete hardware kit (nuts, bolts, electrical connectors, wiring)

Product Description

The Nitrous Express 30040-10 is the brand's entry-level Stage 6 carbureted wet plate system, built for gasoline-fueled engines running a Holley 4150-style square bore 4-barrel carburetor. The Phase 3 Spraybarless billet aluminum plate sits between the carburetor and intake manifold, injecting nitrous and fuel simultaneously through CNC-machined internal passages rather than traditional spray bars - eliminating the risk of spray bar sag, splitting, or airflow restriction. Six jet levels are included covering 50 to 300 wheel horsepower, giving builders the ability to start conservatively and increase the hit as the engine build evolves.

The complete kit includes Lightning Series solenoids with a limited lifetime warranty, a heavy-duty 40-amp relay, a WOT microswitch, a 15-foot stainless braided supply line, and a 10 lb nitrous bottle with the billet aluminum Lightning 45 valve and stainless brackets - everything needed for a full installation. This system is ideally suited for budget-conscious drag racers, street/strip builds, and first-time nitrous users who want proven NX technology without compromise. Note that race fuel is recommended for shots above 150 HP, and this is a gasoline-only system.