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Nitrous Express Nitrous Kit w/Billet LT4 Supercharger Lid w/15lb Bottle

SKU: NEX20939-15

Nitrous Oxide Systems

NEX Nitrous Oxide Kits...

Nitrous Express Nitrous Kit w/Billet LT4 Supercharger Lid w/15lb Bottle

SKU: NEX20939-15

Nitrous Oxide Systems

NEX Nitrous Oxide Kits...

A$6,170.33
Available from MFR. This item is available from the manufacturer's distribution centre. The dispatch timeframe shown is an estimate based on historical order processing and release times for this part. This item is not held in our own warehouse, and actual dispatch timing may vary depending on manufacturer workload and logistics at the time of ordering.

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Description

Nitrous Express Nitrous Kit w/Billet LT4 Supercharger Lid w/15lb Bottle

This Billet LT4 Supercharger Lid replaces the upper supercharger lid on all GM LT4 Superchargers for a quick and clean install. Nitrous and fuel are injected into each cylinder from inside of the supercharger lid, providing direct port style distribution. Systems come standard as a single stage with jetting for 100 to 300WHP. This lid is made from a solid piece of billet aluminum with 1/8NPT machined directly into the lid, which makes it easy to add a direct port water/methanol later on.

Additional Information

Nitrous System with Billet LT4 Supercharger Lid w/15lb bottle

Additional Application Notes
• Incl. 15 lb. Bottle/100-300 WHP Jetting/Upper Supercharger Lid/Carbon Fiber Lightning Solenoids/Lightning 500 Bottle Valve/Braided Lines/Hardware

These additional application notes are supplied by the manufacturer and collated from multiple year ranges. Not all of these notes may apply to every year or every variant. Please contact a StreetFX agent for clarification if required.


Data: v2 - Desc: v4.2 - Upd: 2026-11-08 06:19:44

Data: v4.2 - Upd: 2026-11-08 16:35:10

Features

  • Quick And Clean Install

Important Note Regarding Nitrous & Pressurised Systems

Orders containing nitrous systems or other pressurised canisters may require additional handling and inspection prior to dispatch.

Due to the nature of these products and applicable transport and state regulations, each system is individually inspected, released, and purged where required to ensure compliance with air and road freight standards. While most orders ship within our normal timeframes, this process may occasionally result in slightly longer dispatch times than those advertised.

We do everything we can to minimise delays, and the vast majority of shipments move through without issue. If you are working to a tight deadline or require urgent delivery, please contact us prior to placing your order so we can confirm the most suitable options.

We appreciate your understanding and patience - this process ensures safe, compliant transport and delivery of your order.

(keyword: nitrous express)

Images are supplied by the manufacturer and may be generic. While all efforts are made to provide accurate pictures, there may be differences in the actual product, such as colour, quantity, version, or included components. Please carefully review the description and specifications for details on inclusions or any variations. Some items may be sold individually or in sets, and images may occasionally depict additional products or quantities not included in your purchase. For assistance or clarification, please contact customer support.

Specifications

Product Details

Add-On Part:GENX-2, 16008, 16006, 18959, 11107
Bottle Capacity:15
Bottle Color:White
Bottle Included:Yes
Description:Nitrous Oxide Injection System Kit
Hose Color:Stainless
Hose Material:Stainless Braided
Part Number:nex20939-15
Title:Nitrous Nitrous System with Billet LT4 Supercharger Lid w/ 15lb bottle
Type:Wet
Usage:Strip/Competition

Reference Information

Reference Data (Provide these details to our support team)
Brand Name/s Nitrous Express, Nitrous Express (nx)
StreetFX SKU nex20939-15
SFX Item ID 4125974
Accounting SKU nex-20939-15
Manufacturer SKU 20939-15
Manufacturer UPC 653374976428
Alternative References 20939-15, NEX-20939-15

Nitrous Oxide System, Wet, LT4 Supercharger Lid, Black Anodized, 15 lb. Bottle, Cadillac, Chevrolet, 6.2L, Kit

Nitrous Express LT4 Supercharger lid nitrous systems replace your factory supercharger lid on GM LT4 Superchargers for a quick and clean install. The lids feature an improved airflow design that can increase up to 25 hp by itself, and increase power even more when your system is activated. Nitrous Express LT4 Supercharger lid systems are available as nitrous and nitrous/water methanol systems, with or without bottles. The nitrous spray bar system injects nitrous and fuel above each intake port, providing direct port-like distribution and ensuring maximum performance.

Nitrous systems include:
• Billet aluminum and carbon fiber lightning solenoids
• Industry exclusive billet aluminum Lightning 500 bottle valve
• Stainless steel braided lines
• Stainless steel bottle brackets
• Wiring, switches, and jetting for 100 to 300 wph

Nitrous and water/methanol systems will also include:
• Billet aluminum and carbon fiber lightning water/methanol solenoids
• High-pressure electric pump
• Stainless braided soft lines
• Pre-bent stainless steel hard lines
• Filtered nozzles
• Plated fittings
• Composite reservoir
• Switches
• NX Stage 2 digital progressive methanol controller

Product Attributes
BrandNitrous Express (NX)
Manufacturer's Part Number20939-15
Part TypeNitrous Oxide Systems
Product LineNitrous Express LT4 Supercharger Lid Nitrous Systems
UPC653374976428
Delivery StyleSupercharger lid
Nitrous System StyleWet
Nitrous System Intended Fuel TypeGasoline
Maximum Advertised Horsepower Increase300
ActivationTPS
Jet Sizes Included (hp)50, 100, 150, 200, 250, 300
Bottle IncludedYes
Nitrous Bottle Capacity15 lbs.
Dual StageNo
Bottle MaterialAluminum
Bottle ColorWhite
Bottle Brackets IncludedYes
Bottle Bracket MaterialStainless steel
QuantitySold as a kit.
NotesLid is black anodized.

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