Instant Rebates
Call Our Support Line
24 Hours / 7 Days a Week!  
Same Day Shipping Before 11 PM ET
My Cart
Shop By Vehicle
Shop By
Close Menu
Shop By Vehicle
Top Categories
All Categories

All Categories

Free Catalog
E-Mail Signup
My Account
Track Order
Gift Certificates

Holley 550-510K

Sniper EFI Master Kit with Shiny Finish

Holley 550-510K


made in usa
jegs shipping
FREE Shipping
Easy Returns
Easy Returns
Lowest Price Guarantee
Lowest Price Guarantee
Holley 550-510K Sniper EFI Master Kit with Shiny Finish $1,249.95
Sniper EFI Master Kit
  • Sniper Self-Tuning Shiny Throttle Body
  • 3.5" Touch Screen
  • Fuel System Kit

  • Holley 550-510K Details

    EFI Self-Tuning Kits



    • 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 wire vehicle connection (Battery +, Battery - , Switched Ignition & RPM)
    • 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.
    • Integrated fuel pressure regulator
    • Integrated ignition timing control & coil driver
    • Color touchscreen for setup and gauge views
    • Calibration Wizard NO laptop required for this self-tuning ECU
    • The included Wideband Oxygen Sensor provides real-time fuel map learn.

    Note: If using a Holley Dual Sync distributor, adapter harness p/n 510-558-493 is required to connect to the Sniper EFI.


    Manufacturer's Part Number:

    The Holley Sniper EFI Self-Tuning Kits feature all the benefits of EFI, a perfect option for street cars, muscle cars and off road vehicles. Eliminate typical carburetor cold starting issues, hesitations, flooding and vapor lock. Sniper EFI four fuel injector kits can support up to 650HP. The Self-Tuning ECU makes it an easy, no hassle way to get the most performance out of your vehicle without a laptop computer. With available shiny, black ceramic, or classic bronze throttle body finishes, the Sniper EFI kit also brings style under the hood.

     JEGS Easy Kits are designed by JEGS high performance racing professionals to help you get all the performance parts you need for your race car, hot rod or truck.

    550-510K - Holley Sniper EFI Self-Tuning Kits & Accessories is rated 5.0 out of 5 by 3.
    Rated 5 out of 5 by from Great addition At the price point of these new systems, there's no reason not to switch to EFI these days. Driveability and throttle response has improved tenfold. A slight 'slurping' sound similar to the rear barrels opening on a vacuum actuated carb that is more prevalent than on the carb but I kinda think it's a cool sound (let's you know that its sucking that ait and powering up) and frankly its a small price to pay. I suspect it's the air drawing through the smaller venturi opening. Maybe Holley fixes it going forward, maybe they don't. I'd be fine either way. My worried about noise from the fuel pump were unfounded; can't hear a thing. Great, great product. So THAT'S what a 383 is supposed to feel like? Here I thought 'cranky V8 that can't run cooler than 180 degrees' was the best I could do. Nope - this thing feels like a modern performance engine now.
    Date published: 2017-06-30
    Rated 5 out of 5 by from Big performance increase to our 454! We did not think it would make that much of a difference to our 454 but the power increase is amazing! Starts so much easier also. Installation was a little involved as we were putting this on a 68 impala and had to run a return gas line to the tank. Other than that installation wasn't too bad. Holley will provide great help you if you call them also.
    Date published: 2017-05-29
    Rated 5 out of 5 by from Sniper Install I bought this unit and gas tank for my 67 Mustang. The car has a 428CI FE, 10.5-1 compression and has always been a bear to start when cold. It would just turn over, cough etc for several minutes. Just finished the install and the car fired right up away. Didn't even have to hit the gas pedal. After fighting with this for many years it was great to have it fire up right away. Wished I had done it earlier. But it is still winter here and have not had the chance to put some miles on it will have to wait until spring.
    Date published: 2017-02-14
    • y_2017, m_11, d_20, h_4
    • bvseo_bulk, prod_bvrr, vn_bulk_2.0.3
    • cp_1, bvpage1
    • co_hasreviews, tv_0, tr_3
    • loc_en_US, sid_10001_10001_3578953, prod, sort_[SortEntry(order=RATING, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
    • clientName_jegs

    Can I run this with existing mechanical fuel pump, or do I have to use an electric fuel pump? Thanks.

    Asked by: RE from Miami
    The Sniper EFI systems are designed for an operating pressure of 58.5 PSI. An electric fuel pump is ideal and recommended to accomplish this. Carbureted engines with a mechanical fuel pump typically run between 5-7 psi.
    Answered by: Tech Support
    Date published: 2017-10-18

    Is this a blow Thur , is it capable of being used with a power adder, turbo, procharger ?

    Asked by: Duger
    This is not for use with power adder such as turbo or superchargers.
    Answered by: Jegs Tech
    Date published: 2017-10-18

    Can this system run e85?

    Asked by: krown
    the system can be run with e85 but it is said that due to injector efficiency it can reduce your power up to 30% Thanks
    Answered by: Troy Jr
    Date published: 2017-08-21
    • y_2017, m_11, d_20, h_4CST
    • bvseo_bulk, prod_bvqa, vn_bulk_2.0.3
    • cp_1, bvpage1
    • co_hasquestionsanswers, tq_3
    • loc_en_US, sid_10001_10001_3578953, prod, sort_[SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING)]
    • clientName_jegs
    Easy Kits
    Items You Need

    Before you leave us... Receive a free catalog or join our email list

    Sign up to receive our catalog or subscribe to our email list now to see our exclusive email only specials, new products, and offers!

    Request CatalogJoin Email List