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Holley Sniper EFI Self-Tuning Master System 4 Barrel (4bbl) 550-511k
Holley Sniper EFI Self-Tuning Master System 4 Barrel (4bbl) 550-511k

Holley Sniper EFI Self-Tuning Master System 4 Barrel (4bbl) 550-511k

Your Price: $1,475.95
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Part Number:550-511K

Holley just brought EFI within range with their Sniper EFI Self-Tuning 4 Barrel (4bbl) Master kit with handheld EFI monitor.  It’s economically priced so you can have all the benefits of EFI and still have money to finish or upgrade the rest of your ride! Perfect for Full Size Jeeps, as well as nearly any carbureted vehicle.

With this system, you will put an end to cold start issues, hesitations, vapor lock, and flooding.  This kit features a 4BBL 800cfm throttle body with a 1.6875” Throttle Bore.

Available in Shiny, Black Ceramic and Gold Finishes. 

This is a Master kit, and includes the complete fuel system: fuel pump, filters, feed and return hose and all fittings including fuel tank return line bulkhead fitting.  We sell Base Kits separately that do not include those items (see link below).

4 Stars
Decent system
Got this system now 3 years ago and it has been very good problem is you have to run the Hyperspark distributor to really unlock all the tuning and turn your Jeep into a more modern fuel injection setup. At this point I think I should have waited and went with the Pro-Flow as it is a more inclusive kit. Tuning though is incredible and if you get it done professionally its a very good system. Mileage is great and power is very good. Startup ease is second to none and install is very simple.
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Reviewed by:  from Greenville, NC. on 8/19/2021
  • Fits:All with 4BBL Intake or 4BBL Adapter on 2BBL Intake
  • Bolt on carburetor replacement (designed to fit single & dual carb manifolds)
  • Throttle body mounted ECU – no extra boxes to mount
  • Supports up to 650hp (4 injector version) and 1250hp (8 injector version)
  • 4 wire vehicle connection (Battery +, Battery - , Switched Ignition & RPM)
  • Integrated fuel pressure regulator
  • Integrated ignition timing control & coil driver
  • Color touchscreen for setup and gauge views
  • 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 Wideband Oxygen Sensor provides realtime Fuel Map Learn!
  • Includes complete fuel system consisting of: 20ft of 3/8” Vapor Guard Fuel Hose, 12-920 Fuel Pump, Filters, necessary hardware and bulkhead fitting to return fuel into the tank!
  • Base Kit Without Fuel System Available HERE
  • Machined, Assembled & Tested in the USA (with 1 part from Canada, and the balance from the USA)

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