Holley Sniper EFI Self-Tuning Master Kit Black Finish With Returnless Retrofit Fuel Module

MSRP $2,336.00
You save 10%

Holley Black Finish Sniper EFI Self-Tuning Master Kit with a Returnless Retrofit Fuel Module.

If you’re on the hunt for a kit that will easily allow you to convert your carbureted vehicle to a Sniper EFI without an external fuel pump, it’s time to pick up this Holley Black Finish Sniper EFI Self-Tuning Master Kit with a Returnless Retrofit Fuel Module that’s now available at CJ Pony Parts! 

Features & Benefits:
- Converts Carbureted Vehicle to Sniper EFI without External Fuel Pump
- Combines Sniper EFI Self Learning Throttle Body with In-Tank Retrofit Returnless Module, 20' of Earl’s Vapor Guard Fuel Hose and Required Fittings
- Included Fuel System Places 340LPH Fuel Pump in Tank
- Makes Plumbing Your Sniper EFI Installation as Hassle-Free as Possible: Simply Cap Regulator on Sniper EFI Throttle Body with Included -6an Cap, Safely Route Vapor Guard Fuel Line Along Chassis Back to Die-Cast Fuel Hat and That’s It
- Throttle Body-Mounted ECU: No Extra Boxes to Mount
- Supports Up to 650HP with Four (4) 100-Lb./Hr. Injectors
- Only Four (4) Wiring Connections Required (Battery +, Battery -, Switched Ignition and RPM)
- Integrated Ignition Timing Control and Coil Driver
- Simple Calibration Wizard (Creates Base Map and Starts Tuning on Its Own) with No Laptop Required
- Self-Tuning ECU
- Dual Pattern Bolt-On Carburetor Replacement Designed to Fit 4150 Flange and Spread Bore Manifolds (Spread Bore Sealing Plate Recommended)
- No External Fuel Return Line Required
- High-Resolution Full-Color Touchscreen for Initial Set-Up, Tuning and Gauge Displays
- OEM-Style TPS/IAC and Fuel Pressure Regulator for Years of Dependable Service
- Includes Clamp-On Oxygen Sensor Kit to Ensure Leak-Free Oxygen Sensor Installation with Stainless Steel T-Bolt Clamps and Stainless Steel (Weldable) Oxygen Sensor Flange
- Genuine Bosch LSU 4.9 Wideband Oxygen Sensor Provides Real-Time Fuel Map Learn
- Includes Complete Fuel System: Sniper EFI Retrofit Returnless Module, 20' 3/8" Vapor Guard Fuel Hose, Five (5) Stainless Steel Hose Clamps, Post Filter and Various Earls Fittings and Caps
- Retrofit Fuel Module Installs on Any Fuel Tank 7" to 12" Deep to Fit Wide Variety of Applications
- Internal Fuel Pressure Regulator Eliminates Hassle of Plumbing External Fuel Pressure Regulator (Preset to 58.5 PSI)
- Low-Profile Design: Only 1.275" Thick Above Tank Mounting Surface for Added Clearance When Needed
- Innovative Clamping System Allows You to Locate Module Anywhere in Tank Beside Existing Sending Unit
- Clamping System Lets You Rotate Unit 360-Degrees for Easier Clocking of Plumbing and Wiring Locations Under Vehicle
- Die-Cast Aluminum Construction for Corrosion Resistance and Long-Lasting Good Looks
- 1/4" NPT Ports for Wide Variety of Plumbing Options 

This Holley (550-511D) Black Finish Sniper EFI Self-Tuning Master Kit with a Returnless Retrofit Fuel Module features a throttle body-mounted ECU, which means no extra boxes to mount! It’ll support up to 650HP with four 100lb./hr. injectors and required only four wiring connections. This kit comes with a clamp-on oxygen sensor kit to ensure a leak-free oxygen sensor installation with stainless steel T-bolt clamps and a stainless steel oxygen sensor flange. You’ll also get a retrofit returnless module, vapor guard fuel hose, clamps and more with your order. Plus, this Sniper EFI kit has a low profile to allow for added clearance when you need it! 

Holley (550-511D) Shiny Finish Sniper EFI Self-Tuning Master Kit Specifications:
CFM: 800
Emission Code: 3
Finish: Black
Flange Style: Dual Bolt Pattern
Fuel Pressure: 58.5 PSI
Height: 3.28"
Injector Size: 100 lb/hr @ 58.5 PSI
Inlet / Outlet Size: 9/16-18 Female O-Ring (AN 6)
MAP Sensor: 2Bar
Max Horsepower Rating: 650 Naturally Aspirated
Product Type: Sniper 4BBL TBI Kits 

1965-1986 Mustangs
1948-1979 F-100s
1960-1987 C10s
1966-1977 Broncos 

Order a Holley (550-511D) Black Finish Sniper EFI Self-Tuning Master Kit with a Returnless Retrofit Fuel Module from CJ Pony Parts today!

California Residents: Proposition 65 Warning

Only for use on pre-pollution controlled vehicles: This product can be used on vehicles that were manufactured before emissions control regulations were imposed. Pre-pollution vehicles are defined as:

  • 1965 and older U.S. manufactured California certified vehicles
  • 1967 and older U.S. manufactured federally certified vehicles

Installation Difficulty


Intermediate skill is required for this installation.

Vehicle Fitment

This product will fit the following Bronco years:

This product will fit the following C10 years:

This product will fit the following F-100 years:

  • 1948,
  • 1949,
  • 1950,
  • 1951,
  • 1952,
  • 1953,
  • 1954,
  • 1955,
  • 1956,
  • 1957,
  • 1958,
  • 1959,
  • 1960,
  • 1961,
  • 1962,
  • 1963,
  • 1964,
  • 1965,
  • 1966,
  • 1967,
  • 1968,
  • 1969,
  • 1970,
  • 1971,
  • 1972,
  • 1973,
  • 1974,
  • 1975,
  • 1976,
  • 1977,
  • 1978,
  • 1979,

This product will fit the following Mustang years:

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