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Holly Sniper EFI Stealth 4500, Classic Gold 550-843

Holly Sniper EFI Stealth 4500, Classic Gold 550-843
$3,528.99 ea
NEWARRIVING SOONEstimated Ship Date 03/14/2024 (If Ordered Today)91 Available from HOLLEY PERFORMANCE PRODUCTS as of 02/21/2024
Model: 4008178
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
  • Compatible with Draw through or Blow through forced induction applications
  • High Resolution Full Color Touchscreen for Initial Setup, Tuning, and Gauge Displays
  • Three Programmable 0-5V Sensor Inputs for Oil/Fuel/Dome or Nitrous Pressure or other critical information
  • Required external fuel pressure regulator, 12-848 is recommended
  • Free Software included comprehensive datalogging tool to help you maximize the performance of your engine
  • 2.5Bar MAP Sensor
  • The included Genuine Bosch LSU 4.9 Wideband Oxygen Sensor provides realtime Fuel Map Learn
  • Programmable launch control via 2-step and timing retard. Both can be triggered by a trans-brake input
  • -8AN Fuel Inlets
  • 2.125" Throttle Plates, Flow 1440 CFM for large cubic inch engines
  • 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
  • Only 4 Wiring Connections Required! (Battery +, Battery - , Switched Ignition & RPM)
  • Gen 3 Ultra Dominator Style 4 Bolt Air Cleaner Flange
  • OEM Style TPS/IAC, for years of dependable service
  • Programmable Target Air Fuel Ratios per Boost level
  • Integrated ignition timing control
  • Supports up to 1500 HP Naturally Aspirated or 1250 HP Forced Induction with Eight 100 Lb/Hr Injectors
  • User friendly Boost Control with handheld adjustability
  • One +5v Reference Output - +5V Power Supply for 0-5v Sensors, One Sensor Ground – Ground supply for 0-5v Sensors
  • Built-in Single Stage Wet or Dry progressive nitrous control
  • Customizable secondary fuel pump output (TPS, RPM or Boost enabled)
  • Self-tuning ECU means you don’t have to be a computer/tuning wiz to have EFI!
  • Advanced boost control available via free Sniper EFI tuning software, including Boost vs RPM and Boost vs Time
  • Throttle body mounted ECU – no extra boxes to mount
  • Real-time datalogging to the included 3.5" Touch Screen, allows you to save information to the SD card without needing a communication cable
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
Installation Notes:
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


Download Name File Size



CFM 1440
Coast Guard Approved Yes
Emission Code 3
Finish Classic Gold
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 2.5Bar
Max Horsepower Rating 1250 Forced Induction
Part Type Fuel Injection Throttle Body
Product Type Sniper EFI 4500
Proposition 65 www.P65Warnings.ca.gov
Throttle Bore 2.125 inch


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Holly Sniper EFI Stealth 4500, Classic Gold 550-843:
Classic Chevy 2024