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In-Store Pickup Location

Holley Sniper EFI Stealth 4500 Fuel Injection Systems 550-842

Fuel Injection System, EFI Stealth 4500, Black, 1440 cfm, Gasoline, Kit

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Brand: Holley Sniper

Manufacturer's Part Number: 550-842

Part Type: Fuel Injection Systems

Product Line: Holley Sniper EFI Stealth 4500 Fuel Injection Systems

Summit Racing Part Number: SNE-550-842

UPC: 090127045275

Self Tuning: Yes

User Tunable: Yes

Maximum Horsepower with Gas: 1,500

Timing Control Compatible: Yes


Transmission Controller Included: No

Injection Style: Throttle body

Metering Style: Speed density

Power Adder Compatible: Yes

Intake Manifold Included: No

Fuel Rails Included: No

Throttle Body Included: Yes

Throttle Body Mounting Flange: 4500 Dominator

Venturi Quantity: 4

Venturi Diameter (mm): 54.00mm

Airflow Rate (cfm): 1,440 cfm

Throttle Body Material: Aluminum

Throttle Body Finish: Black

Injectors Included: Yes

Injector Size (lbs/hr): 100 lbs./hr.

Calibration Module Included: Yes

ECM Included: Yes

Wiring Harness Included: Yes

Oxygen Sensor Included: Yes

Fuel Pump Included: No

Fuel Pressure Regulator Included: No

Distributor Included: No

MAP Sensor Included: Yes

IAT Sensor Included: No

TPS Sensor Included: Yes

IAC Motor Included: Yes

Quantity: Sold as a kit.

Notes: Not for use with engines producing less than 800 hp. For use with gasoline only. Use of leaded race fuels may shorten the service life of the WBO2 sensor.

In-Store Pickup: Choose In-store pick-up (OH, NV, GA, TX) on our web site.

Holley Sniper EFI Stealth 4500 fuel injection systems are what you need to convert your dragster or Pro-street vehicle to fuel injection. For engines producing 800+ hp, the Sniper Stealth 4500 systems feature 8 100 lbs./hr. injectors and a throttle body that flows a massive 1440 cfm. These Holley systems come with a USB to CAN tuning cable and free downloadable Sniper EFI software to give you unlimited control of your engine. Holley Sniper Stealth 4500 systems will also look great under the hood in your choice of shiny, ceramic black, and classic gold finishes.

Features and benefits include:

* Supports up to 1500 hp naturally aspirated or 1250 hp forced induction with 8 100 lbs./hr. injectors
* Compatible with draw-through or blow-through forced induction applications
* 2.125 in. throttle plates, flow 1440 cfm for large cubic inch engines
* 2.5Bar MAP sensor
* Integrated ignition timing control
* Programmable launch control via 2-step and timing retard. Both can be triggered by a trans-brake input
* Gen 3 Ultra Dominator-style 4-bolt air cleaner flange
* -8AN fuel inlets
* High-resolution full color touchscreen for initial setup, tuning, and gauge displays
* Simple calibration wizard--answer a few questions about your engine and it creates the base map, then starts tuning on its own! No laptop required
* Self-tuning ECU means you don't have to be a computer/tuning wiz to have EFI
* The included genuine Bosch LSU 4.9 wideband oxygen sensor provides real time Fuel Map Learn
* Built-in single-stage wet or dry progressive nitrous control
* Three programmable 0-5 V sensor inputs for oil/fuel/dome or nitrous pressure or other critical information
* Six programmable ground outputs, five programmable ground inputs. These can be used to trigger or control external devices, such as nitrous solenoids and boost control solenoids. Or to provide the ECU with an input to turn on function, such as an ignition timing
* One +5 V reference output, +5 V power supply for 0-5 V sensors, one sensor ground supply for 0-5 V sensors
* Throttle body mounted ECU--no extra boxes to mount
* Only 4 wiring connections required--battery +, battery -, switched ignition, and rpm
* Required external fuel pressure regulator, 12-848 is recommended
* Customizable secondary fuel pump output (TPS, rpm, or boost enabled)
* User-friendly boost control with handheld adjustability
* Free software included--comprehensive data logging tool to help you maximize the performance of your engine
* Real-time data logging to the included 3.5 in. touch screen allows you to save information to the SD card without needing a communication cable
* Programmable target air fuel ratios per boost level
* Advanced boost control available via free Sniper EFI tuning software, including boost vs. rpm and boost vs. time
* OEM-style TPS/IAC, for years of dependable service
* Included clamp-on oxygen sensor kit ensures a leak-free oxygen sensor installation, with stainless steel T-bolt clamps and a stainless steel (weldable) oxygen sensor flange
* Patent Pending

Questions & Answers Ask a Product Question

I have 410 reving to over 9000rpm.I have I have been using cards for a long time and I want gasoline economist. But I can not because I have to use a dominator cards.Can I use it on the street and track without problems?

Asked by ELMER on July 05, 2018


Yes you can .we have it on a 1800 hrp twin turbo 572cui . BBC and it run awesome on the street.

LARRY from CA answered on November 30, 2018

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Is this 16V compatible?

Asked by AULT on October 01, 2018


Thank you for your question. Holley Sniper 550-842 fuel injection system is compatible with 16v applications.

Summit RacingSummit Racing Answer - November 06, 2018

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Is this e85 compatible?

Asked by CHRISTOPHE on June 10, 2018



TIMOTHY from NC answered on June 27, 2018

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Can I come t this to my racepak?

Asked by TREVOR on March 06, 2019

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+See All Questions (7)

Some parts are not legal for use in California or other states with similar laws / regulations

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