Nitrous Express NX604 4150 4-BBL Gemini Twin Stage 6 Conversion Kit Plate

The Nitrous Express NX604 is a 4150 4-BBL Gemini Twin Stage 6 conversion plate kit designed for enthusiasts upgrading or switching to the Nitrous Express Next Generation nitrous system platform. Rated for 50–300 wheel horsepower, this conversion kit provides everything needed to transition from an EFI single-nozzle setup to a plate system, or to convert from another brand's nitrous system to the Nitrous Express lineup.

Gemini Plate Technology:

The Gemini plate design represents the most technically advanced single-stage plate architecture available. Its perimeter spray, direct-port injection pattern ensures precise nitrous-to-fuel distribution across all cylinders, solving common distribution problems found on single-plane manifolds. With no spray bars to sag, split, or obstruct airflow, the Gemini plate delivers superior atomization and outstanding consistency.

Kit Includes:

• Gemini Twin Stage 6 nitrous injection plate (fits standard 4150 flange carburetors)
• Jets and HP setting configurations for 50, 100, 150, 200, 250, and 300HP
• All necessary connectors and hardware
• All components begin after the solenoids — designed to integrate with your existing solenoid setup

Key Features:

• Direct-port spray pattern for perfect cylinder-to-cylinder distribution
• No spray bars — eliminates airflow obstruction and mechanical failure points
• Compatible with standard 4150 flange carbureted applications
• 50–300 WHP power range with six adjustable jetting stages
• Part of the Nitrous Express Next Generation nitrous platform
• Complete hardware included for a straightforward conversion

Whether upgrading from EFI or converting from a competitor's system, the NX604 Gemini Twin Stage 6 conversion kit delivers the reliability and performance of the Nitrous Express Next Generation platform with a clean, efficient plate injection design.