My Account
My Garage
Shopping Cart
MY GARAGE Select Vehicle
MY GARAGE

Nitrous Express NX674 Assassin Plate Conversion Kit 4150 Stage 6 Nitrous System

Manufacturer

Part Number

NX674
Sale Price

$531.50

Estimated ship date Tuesday, November 24

Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Nitrous Express NX674 Assassin Plate Conversion Kit is a high-performance Stage 6 nitrous oxide plate system designed for 4150-flange carburetors. This conversion kit allows racers and performance enthusiasts to upgrade their existing Assassin plate setup to a full Stage 6 configuration, delivering aggressive power gains with the reliability and precision Nitrous Express is known for.

Key Features:

  • Compatible with 4150-flange carburetor applications
  • Stage 6 configuration for maximum nitrous delivery and power output
  • Designed as a conversion kit for the Nitrous Express Assassin plate system
  • Precision-machined plate construction for consistent, repeatable performance
  • Engineered for both street and strip use
  • Manufactured by Nitrous Express, a leading name in nitrous oxide delivery systems

Nitrous Express has been a trusted manufacturer of nitrous oxide systems since 1995, known for innovative designs and race-proven reliability. The Assassin plate series represents their commitment to top-tier nitrous delivery for serious performance builds. The NX674 conversion gives you the flexibility to advance your system to Stage 6 performance without replacing your entire nitrous setup.

Products specifications

Prop 65

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Great and items were just as pictured/described.

Great and quick service.

payed for 2 day air and it took 4to 5 working days to get my order. one of the shafts on the motor was on the out side of the box. not real happy.

Easy to order

Best price by far and fast free freight, couldn't ask for more.

I ordered the wrong size. However, I am returning this item. Only to order the correct one. I must say.... Everything is going smoothly and I want to thank you.

Quick and accurate

Share icon
Return Policy
Returns are easy at THMotorsports

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy