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550-842 - Sniper EFI Stealth 4500 - Black Ceramic Finish - default Image
550-842 - Sniper EFI Stealth 4500 - Black Ceramic Finish - additional Image
550-842 - Sniper EFI Stealth 4500 - Black Ceramic Finish - additional Image
550-842 - Sniper EFI Stealth 4500 - Black Ceramic Finish - additional Image
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Sniper EFI Stealth 4500 - Black Ceramic Finish

Sniper EFI Stealth 4500 - 8 Injector - 800-1500 HP

Finish

PART# 550-842

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United States Coast Guard Approved
Certified to ISO 8846, SAE J1171 Requirements
Not for use with engines producing less than 800 horsepower Gasoline Only Use of leaded race fuels may shorten the service life of the WBO2 sensor

Overview

Introducing the Sniper Stealth 4500 EFI System! Wanting to convert your Dragster or Pro-street vehicle to Fuel Injection? Look no further! The Sniper Stealth 4500 EFI system from Holley features 8, 100LB/HR Fuel Injectors capable of supporting 800 to 1500 HP naturally aspirated, or 800-1250 HP on forced induction applications. The Sniper Stealth 4500 also features multiple Input and Output options for sensor inputs and switched outputs to control external relays. This system also comes with a USB to CAN tuning cable and free downloadable Sniper EFI Software give you unlimited control of your engine

Features:

  • Supports up to 1500 HP Naturally Aspirated or 1250 HP Forced Induction with Eight 100 Lb/Hr Injectors
  • Compatible with Draw through or Blow through forced induction applications
  • 2.125” 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 realtime Fuel Map Learn
  • Built-in Single Stage Wet or Dry progressive nitrous control
  • Three Programmable 0-5V 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, boost control solenoids. Or to provide the ECU with an Input to turn on function such as an ignition timi
  • One +5v Reference Output - +5V Power Supply for 0-5v Sensors, One Sensor Ground – Ground supply for 0-5v Sensors
  • Throttle body mounted ECU – no extra boxes to mount
  • Only 4 Wiring Connections Required! (Battery +, Battery - , Switched Ignition & 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 datalogging tool to help you maximize the performance of your engine
  • Real-time datalogging to the included 3.5” 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

Specs

BrandHolley Sniper EFI
CFM1440
Coast Guard ApprovedYes
Emission Code3
FinishBlack Ceramic
Flange Size4500
Flange Style4500
Fuel Pressure58.5 PSI
Height3.85"
Injector Size100 lb/hr @ 58.5 PSI
Inlet / Outlet Size8AN
MAP Sensor2.5Bar
Max Horsepower Rating1250 Forced Induction
1500 Naturally Aspirated
Product TypeSniper EFI Stealth 4500
Throttle Bore2.125 inch
Part Number550-842

Service Parts


Emissions

This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles and Racing Use Only Vehicles.

The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles:

  • 1965 and older U.S. manufactured California Certified vehicles
  • 1967 and older U.S. manufactured Federally Certified vehicles
  • 1967 and older Foreign manufactured vehicle

The following vehicles are considered Racing Use Only Vehicles:

  • Racing Use Only Vehicles are vehicles that are used exclusively for competition and that are not registered and that may never be used on the street

WARNING: It is against the law to install this part on an Emissions Controlled Vehicle

The following vehicles are considered Emissions Controlled Vehicles:

  • 1966 and newer U.S. manufactured California Certified vehicles
  • 1968 and newer U.S. manufactured Federally Certified vehicles
  • 1968 and newer Foreign manufactured vehicle

Tech Resources

Not for use with engines producing less than 800 horsepower Gasoline Only Use of leaded race fuels may shorten the service life of the WBO2 sensor

Q&A

Have a question about this product?

  • Question

    What fuel pump and regulator do you recommend for an 900HP 540 BBC bracket dragster? (Nothing trick) It does have Mikes Fab Shop S.S. headers with an O2 port in each header. and can I use my 7AL3 box? 4500 stall converter, 1900 LBS with me and ran 7.90''s with a conventional 4500 setup and belt pump on gas. (It is a Enderle 7 GPM fuel pump) Will this pup work? or should I sell it with the carb? Thanks Bob Lupini

    By Bob L. on July 13, 2019

    Answer
    Fuel system recommendations are in the instructions. https://documents.holley.com/199r11322r.pdf That being said, the 12-1500 is the fuel pump that we would recommend for your application.
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