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Holley Sniper EFI Stealth 4500 - Classic Gold

Part # 550-843 Be the first to write a review

Supports Up To 1500HP - 3.5 in. Handheld Monitor - 8x100 LB/HR Injectors

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Holley Sniper EFI Stealth 4500 - Classic Gold

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Wanting to convert your Dragster or Pro-street vehicle to Fuel Injection? Sniper, the #1 Fuel Injection Conversion system has you covered with the Stealth 4500. Featuring 8 100LB/HR Fuel Injectors this kit is the perfect option for any build looking to make between 800-1500HP. We have many Sniper options for builds going from mild to wild. This is the perfect set up for the more extreme build with multiple input and output options for sensor inputs and switched outputs to control external relays. 2.125" throttle plates, flows 1440 CFM for larger cubic inch engines. Included 2.5BAR Map sensor and programmable launch control via 2-step which can be triggered by the trans-brake input. Simplicity is what we strive for when it comes to everything related to EFI conversion! Sniper is designed to be installed at home in your garage or driveway with limited tools and the support of Holley's comprehensive installation manual and videos. An afternoon in the garage and you will be enjoying improved engine performance, better MPG's and easier starting. You don't have to be a computer wiz or tuning professional to run a sniper kit on your build. Our calibration wizard allows you to just answer a few questions about your engine and the system will begin self-tuning with no laptop required. Use the high resolution 3.5" full color touchscreen for tuning and gauge displays. Once you made your conversion to EFI, don't stop there! Sniper is an Ecosystem! This kit pair's seamlessly together with Holley's Sniper Hyperspark Ignition, Fuel System's, Air Cleaners, Throttle Body & Digital Dash to unlock the full potential of your build. For a full list of features & benefits on what the Sniper Stealth 4500 has to offer, see below!

Features:

  • Self-tuning ECU means you don’t have to be a computer/tuning wiz to have EFI!
  • 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)
  • Compatible with Draw through or Blow through forced induction applications
  • High Resolution Full Color Touchscreen for Initial Setup, Tuning, and Gauge Displays
  • 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
  • 2.125" Throttle Plates, Flow 1440 CFM for large cubic inch engines
  • Gen 3 Ultra Dominator Style 4 Bolt Air Cleaner Flange
  • -8AN Fuel Inlets
  • 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.
  • 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
  • Supports up to 1500 HP Naturally Aspirated or 1250 HP Forced Induction with Eight 100 Lb/Hr Injectors
  • 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
  • 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
  • Real-time datalogging to the included 3.5" Touch Screen, allows you to save information to the SD card without needing a communication cable
  • 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
United States Coast Guard Approved
Certified to ISO 8846, SAE J1171 Requirements

About Holley Sniper EFI

Explore Sniper's high-performance fuel system products to build your affordable high-performance fuel system at Holley.com!

Accelerometer SupportNo
Air Metering StyleSpeed Density
Boost ControlNo
Brand Holley Sniper EFI
CAN-BUS SupportNo
CategoryAir and Fuel Delivery
CFM1440
Coast Guard ApprovedYes
Coil Per Cylinder Ignition SupportNo
Datalogging SupportYes
Distributor IncludedNo
Dry Nitrous ControlYes
e85 SupportNo
EGT SupportNo
Emission Code3
FinishClassic Gold
Flange Size4500
Flange Style4500
Forced Induction SupportYes
Fuel Filter IncludedNo
Fuel Hose IncludedNo
Fuel Injectors IncludedYes
Fuel Pressure58.5 PSI
Fuel Pressure Regulator IncludedNo
Fuel Pump IncludedNo
Grade TypePerformance
Height3.85"
Ignition Timing ControlYes
Individual Cylinder Fuel CorrectionsNo
Injector Size100 lb/hr @ 58.5 PSI
Inlet / Outlet Size8AN
Intake Manifold IncludedNo
Knock Retard SupportNo
MAP Sensor2.5Bar
Max Horsepower Rating1250 Forced Induction, 1500 Naturally Aspirated
Multi-Stage Nitrous ControlYes
Part TypeFuel Injection Conversion Kit
Product TypeSniper EFI 4500
Progressive Nitrous ControlYes
Self-TuningYes
Sub CategoryService Kits
Throttle Bore2.125 inch
Throttle Position Sensor IncludedYes
Traction Control SupportNo
User-TuneableYes
Wet Nitrous ControlYes
UPC090127045282
Part Number550-843
3

This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) 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


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
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

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