My Account  |  0 item(s)    View Cart
Holley Sniper EFI Self-Tuning Master System 4 Barrel (4bbl)

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

Your Price: $1,259.95
Free Shipping.
Part Number:550-51

Choose Options


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).

5 Stars
Money well spent
I've been converting carb vehicles to FI since 1997, this is my favorite "bolt on" TBI kit so far. I've used GM junkyard systems, Holley Pro-jection, FAST EZefi, FiTech, howell kits, Mopar Perf multi-port klt (inline 6). This sniper kit is well worth the money. Its very thought out and engineered, backed by good tech support should you need it...a competitor to this kit can't claim that and it's made in China, this is USA made. I am running this on a 401, stock other than a .480 lift 224 @ .050/ 277 adv dur cam and edelbrock performer intake. This FI kit compliments the engine very well. I battled with two different carbs and was never happy with the way it ran, after installing the sniper the engine came to life and runs like it should now. I used the stock 5/16 feed line as my return line back to the tank and then used the 1/4" return tube in the sending unit to return the fuel system, Holley recommends 3/8" on both feed and return lines, I along with others have had no trouble running the stock lines for the fuel system, proceed at your own risk though. I am feeding from the factory 5/16" tube from the sending unit into a 3/8" line all the way to the throttle body. While i am using the included frame mounted pump I will be swapping in a blazer tank and changing to an in tank pump at that time. No issues so far though.
Did you find this helpful?  17 of 17 Found Helpful
Reviewed by: (Verified Buyer)  from SD. on 9/15/2018
5 Stars
Most awesome product
I recently installed this on my CJ7,(it's got a 360) and I am utterly amazed at the ease of install, the quality of components and the increased power, performance and most importantly... FUEL MILEAGE INCREASE!! I went from 6mpg to a little over 12mpg and it's getting better at each fillup. I want to thank Ryan for answering all my questions as well. It's a good investment for the price. Next this setup WILL be going on my J-4000 truck. No more problems due to the darn ethanol fuels. Hats off to Holley for this product and a generous bow to BJ's for carrying it.
Did you find this helpful?  2 of 2 Found Helpful
Reviewed by: (Verified Buyer)  from New Mexico. on 6/19/2019
  • 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)

Related Items