Best Nos Nitrous Kits in 2026

Brand New Holley Super Sniper EFI 4150 650 HP Forced Induction Sniper EFI 4 Barrel Fuel Injection Conversion, Self-Tuning Kit & Handheld EFI Monitor, Classic Gold (Holley Part #550-520)

Specs: Brand: Holley Sniper EFI | CFM: 800 | Emission Code: 3 | Finish: Classic Gold | Height: 3.28" | Injector Size: 100 lbs./Hr at 58.5 PSI | Inlet/Outlet Size: 9/16-18 Female O-Ring (AN 6) | MAP Sensor: 2.5 Bar | Max Horsepower Rating: 650 Forced Induction | Product Type: Sniper 4BBL TBI Kits | Transmission: 700R4/200R4, TH350

Introducing Holley Super Sniper EFI! Looking to convert your blow thru carbureted turbo engine to EFI? Look no further. Holley offers a 650 HP four injector version for lower horsepower applications with a power adder or someone just needing additional sensor inputs. Did we mention the Super Sniper also has full nitrous control built-in?

Brand New Holley EFI Terminator X Max GM Gen V LT Late Direct Injection Kit with GM LT Drive-by-Wire Throttle Body Control & GM 4L60/4L80 Transmission Control, 3.5" Touch Screen (Holley Part #550-1631)

Do not settle for a factory ECU with a cumbersome tuning interface when you can have technology of Holley EFI. Features real-time fuel learn, an integrated 1bar MAP sensor & 4 programmable inputs & outputs. Inputs & outputs are ideal for electric fans, boost control solenoids, progressive nitrous control & more.

Terminator X comes fully loaded with base maps for common LT engine combinations. 3.5" touch screen LCD handheld contains an easy to use calibration wizard as well as tuning & gauge display functions. Kits will come with an external Gasoline Direct Injection Controller, enabling users to control & tune, factory injectors, GM Gen V LT Variable Valve Timing (VVT) & factory fuel pumps.

Brand New NOS Sniper Wet Nitrous Plate Kit, 100-150 Adjustable Horsepower, 10 lb Orange Bottle, Compatible with 4 Barrel Holley 4150 & Carter AFB (Holley Part #07001NOS)

The engineers at NOS have hit a bullseye by designing the finest entry-level nitrous system available today with the NOS Sniper kit. The Sniper is the economical "entry-level" kit from NOS that simply blows away competitive kits. The Sniper was developed to introduce enthusiasts to the use of nitrous at a very affordable price. This system is a safe & reliable street/strip system that fits popular 4 barrel applications.

The Sniper is a fully adjustable system that is designed to provide from 100-150 extra HP in popular 4 bbl square bore or spread bore applications. In dyno tests conducted by Chevy High Performance magazine the Sniper system produced an extra 163 HP when installed on a 355 CID small block Chevy with torque increased by an astounding 195 lb/ft.

Brand New NOS Single Fogger Wet Nitrous System, 10lb Black Bottle, 250 Max HP, Compatible with 2005-20 Dоdge & Сhrysler 3.5L/3.6L V6 & 5.7/6.1/6.4 НEMI V8 (Part #06016BNOS).

For GМ, Fоrd, and Mоpar. Provide the easiest way to add a wet nitrous system to a V6 or V8 vehicle. Each system utilizes a NOS Fogger Soft Plumb nozzle for smooth power delivery & easy jet changes. Includes a 10 lb black bottle kit, NOS Powershot fuel & nitrous solenoids, microswitch, jetting for 50, 100 & 150 horsepower levels, along with hardware & instructions.

Features: Utilizes a NOS Fogger Soft Plumb wet nozzle to provide smooth power delivery | Single nozzle system offers easy installation, excellent value & great power gains | Black system provides a stealthy appearance | Includes jetting for 50, 100, & 150 rear wheel horsepower

Brand New NOS Nitrous Refill Pump Station, Partial Kit, Includes Gauge & Valve, All Fittings Except Compressor Supply & Mother Bottle Stand (Part #14251NOS).

The NOS Refill Station is designed for performance retailers in the business of refilling nitrous bottles or racers who use a substantial amount of nitrous oxide. The Refill Station comes complete with all the plumbing, hoses, gauge, valve, fittings, and bottle stand necessary to transfill nitrous from a mother cylinder to the receiving bottle instantly.

Refill Station will require three items not included in the kit: A compressed air supply (80-100 PSI @20CFM) | Mother bottle (through local gas supplier) | Scale (as bottles are filled by weight)

Brand New NOS Single Fogger Wet Nitrous System, 10 lb. Blue Bottle, 35-75 HP, Compatible with 4 & 6 Cylinder Multi-Point ЕFI Engines (Part #05130NOS).

Wet type kits are offered for most turbocharged and supercharged applications due to the increased air velocity and extra heat from the forced induction.

Features: Multi-Fit Nitrous System | Exclusive NOS Soft-Plume Stainless stee lFogger nozzle producing the finest & safest fuel/nitrous mixture | NOS 10 lb blue bottle with brackets & high flow bottle valve | Industry leading instruction manual | 35-50-75 horsepower jetting for 4 and 6 cylinder kits | Micro switch, safety relays & all other components are included for simple installation

Brand New Holley Sniper EFI Stealth 4500 4 BBL Fuel Injection System,1440 CFM,1500 HP, Polished, Fits 4500 Flange Style Manifolds (Holley Part #550-841)

Specs: Brand: Holley Sniper EFI | CFM: 1440 | Coast Guard Approved: Yes | Emission Code: 3 | Finish: Polished | Height: 3.28" | Flange Size: 4500 | Flange Style: 4500 | Fuel Pressure: 58.5 PSI | Height: 3.85"

Injector Size: 100 lb/hr @ 58.5 PSI | Inlet/Outlet Size: 8AN | MAP Sensor: 2.5 Bar | Max Horsepower Rating: 1250 Forced Induction 1500 Naturally Aspirated | Product Type: Sniper EFI Stealth 4500 | Throttle Bore: 2.125"

Brand New NOS Nitrous Refill Pump Station Complete with Regulator Filter Separator, and Scale (Part #14254NOS).

The NOS refill station is designed for performance retailers in the business of refilling nitrous bottles or racers who use a substantial amount of nitrous oxide. Gone are the days of freezing the receiving bottle overnight in order to get a full bottle the next day. With the included regulator/water separator & scale, all you need is a compressed air supply and a mother bottle to start making money refilling bottles.

Features: Safe, Easy & Quick | Takes A Minute Or Two | Requires No Electrical Hook-Up | Weight scale for highly accurate measurement of nitrous | Instant Nitrous Transfill

Brand New NOS Sniper Wet Nitrous Plate Kit, 150-250 Horsepower, 10 lb Orange Bottle, Compatible with Quadrajet, Thermoquad, Holley Spread Bore carburetors & Sniper EFI systems (Holley Part #07007NOS)

NOS have built on the very popular, budget friendly, Sniper nitrous kits for those who need a little more power from their engines. The new Sniper 250 kits step up the power potential to an additional 250 horsepower, in a low cost single nitrous plate kit, for the popular carburetors, Holley 4150 Square Flange, Part #07002NOS, 4500 Dominator, Part #07003NOS & Spread Bore Quadra jet, Part #07007NOS.

These single stage wet kits have everything needed to add some extra power to your engine. The kit includes a 10 lb. Sniper orange nitrous bottle, 14 ft. -4AN feed line, stainless bar nitrous plate & the new, large body, Sniper Solenoids. Also included is all the hardware required as well as nitrous & fuel jetting for power levels of 150, 175, 200 & 250 horsepower.