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Holley EFI Sniper EFI Stealth 4500 Throttle Body System 550-843

Fuel Injection Throttle Body


Sniper EFI Stealth 4500 Throttle Body System; 800-1500HP; 8 Injector; Incl. O2 and Coolant Temp Sensor/Gaskets/3.5 in. Touch Screen Controller/Harness/Hardware; Gold Finish;

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  • Supports Up To 1500 HP NA Or 1250 HP Forced Induction
  • Simple Calibration Wizard - No Laptop Required
  • Self-Tuning ECU Means You Dont Have To Be A Computer/Tuning Wiz
  • Bosch LSU 4.9 Wideband O2 Sensor Provides Realtime Fuel Map Learn
  • Eight 100 lb../hr. Injectors
  • Compatible w/Draw or Blow Through Forced Induction Apps.
  • 2.125 Throttle Plate; Flow 1440 CFM
  • Integrated Ignition Timing Control
  • Programmable Launch Control Via 2-Step/Timing Retard
  • Gen 3 Ultra Dominator Style 4 Bolt Air Cleaner Flange
  • -8AN Fuel Inlets
  • Full Color Touchscreen for Initial Setup/Tuning/Gauge Displays
The Sniper Stealth 4500 EFI system 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 features multiple Input/Output options for sensor inputs and switched outputs to control external relays. This system comes with a USB to CAN tuning cable and free downloadable Sniper EFI Software give you unlimited control of your engine. * 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 timing/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.


Injector Size:100 lb/hr @ 58.5 PSI
Throttle Bore:2.125 in.
WARNING CA Proposition 65 Message:WARNING: Cancer and Reproductive Harm -
WARNING CA Proposition 65:Yes


  • 550-843
  • 550-843
  • Holley EFI
  • New

Shipping Information

  • Item Requires Shipping
  • 16.0 lbs.
  • W13.0000” x H6.5000” x L25.0000”

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