Air and Fuel› Nitrous Oxide Systems and Components

Nitrous Express

Nitrous Express - 4150 4-BBL PROPOWER - NX504

$266.14

SKU: N004 NX504

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

Nitrous Express 4150 4-BBL ProPower Plate System is an innovative power-boosting solution designed for enthusiasts seeking substantial horsepower gains. This system, part number NX504, integrates seamlessly with 4150-style carburetors, making it a versatile choice for a wide array of performance applications. It offers adjustable horsepower settings ranging from 100 to 500 HP, allowing users to precisely tailor the power output to their specific needs and track conditions.
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Part #: NX504

Nitrous Express offers a complete line of conversion kits for all of our systems. Whether you are upgrading from a EFI single nozzle system to a plate system, or converting from another brand to one of our Next Generation nitrous systems. Nitrous Express has exactly what you will need to make the conversion complete. All the conversions begin after the solenoids and include all the necessary hardware. Nitrous Express is the only nitrous company to date that has the confidence in our product to improve your performance and reliabilityaguaranteed! Includes plate, connectors, jets and hp settings.

4150 4-BBL PROPOWER

This product may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandNitrous Express
Part NumberN004 NX504
5,000+ Trusted brands
1M+ Enthusiasts
5M+ Parts sold
(760) 282-4645 hello@motormia.co

Buy with Confidence

Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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