550-842 Sniper EFI Stealth 4500 with Black Ceramic Finish

Vehicle Info Needed

HOLLEYPART NUMBER: 510-550-842

550-842 Sniper EFI Stealth 4500 with Black Ceramic Finish

Name: 550-842 Sniper EFI Stealth 4500 with Black Ceramic Finish
Brand: HOLLEY
SKU: 510-550-842
Price: 1953.95 USD
Availability: InStock

^$1,953⁹⁵$2299.95You Save$346.00

Ships on 09/14/2026

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Black Ceramic Finish

Sniper EFI Stealth 4500

4500 Dominator Flange

Supports 800-1500 HP

Forced Induction & Nitrous Compatible

Built in 2-Step, Timing Retard, Nitrous Control

(8) 100 lb.-hr Injectors

Black Ceramic Finish

Holley 550-842 Sniper EFI Stealth 4500 with Black Ceramic Finish Features:

Self-tuning ECU with Calibration Wizard requires no laptop

3.5-inch high-res color touchscreen for calibration, tuning, gauges, and data logging

4500 flange with 2.125 in. throttle blades flow 1440 CFM

Supports up to 1500 HP naturally aspirated or 1250 HP forced induction

Gen III Ultra Dominator style 4 bolt air cleaner flange

Throttle body mounted ECU (requires no ECM mounting)

Nitrous and Forced Induction Compatible

Compatible with either draw-through or blow-through forced induction applications

Programmable target AFR for boost level

Integrated single stage wet or dry progressive nitrous controller

Integrated boost control

2.5 bar MAP sensor supports 21.5 lbs. of boost

Programmable Inputs/Outputs

Programmable launch control by using 2-step and timing retard functions

6 programmable ground outputs for triggering external devices (ex. nitrous solenoids)

5 programmable inputs for turning on certain functions (ex. timing retard)

Customizable secondary fuel pump output (can be activated by TPS, RPM, or boost)

Holley 550-842 Sniper EFI Stealth 4500 with Black Ceramic Finish Specs:

Flange Size: 4500
Fuel Pressure: 58.5 PSI (requires external fuel regulator)
Height: 3.850 in.
Injector Size: 100 lb.-hr
Inlet/Outlet Size: -8 AN
Map Sensor: 2.5 Bar
Throttle Bore: 2.125 in.
CFM: 1440

Holley 550-842 Sniper EFI Stealth 4500 with Black Ceramic Finish Notes:

Not for use with engines producing less than 800 horsepower
Gasoline fuel only
Use of leaded race fuels will shorten oxygen sensor life
For Troubleshooting Tips setting up your New Holley Sniper EFI System, please see this helpful video from Holley Performance.

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART

Part TypeFuel Injection System

BrandHOLLEY

Package Height8.3

Package Width12.0

Package Length24.2

Weight16.66 PG

Part CategoryPerformance Parts

Injector Size (Lbs./Hr.)100 lbs./hr.

Injector Quantity8

Part FitmentDirect Fit

Maximum Horsepower1500 HP