Product Summary

Universal Fit, Throttle Body Injection Style, Polished

    Key Specs

    Injection StyleThrottle Body
    CFM870 CFM
    Injector Size100 lbs./hr.
    Max Horsepower Rating1250
    ECM IncludedYes

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    Holley Sniper 550-876 Details

    The Super Sniper Stealth 4150 EFI system from Holley features 8, 100LB/HR Fuel Injectors capable of supporting up to 650 HP naturally aspirated or 1250 HP on forced induction applications. The Sniper Stealth 4150 ECU is capable of fuel map self-learning and ignition timing control, improving idle stability, drivability, and wide-open throttle horsepower! Did we mention that the Stealth 4150 also includes transmission kick down provisions for GM TH350/400, 200R4/700R4 and Ford C4/C6 applications.


    • Bolt-on 4150 Flange Carburetor Replacement
    • Throttle body mounted ECU – no extra boxes to mount
    • Supports up to 1250hp with Eight 100 Lb/Hr Injectors!
    • Includes high-pressure fuel crossover line
    • All of the wiring exits below the rear fuel injector cover, for a completely stealth installation.
    • Timed spark part for vacuum advanced distributors located under the front fuel bowl, for easy access to the distributor.
    • Programmable inputs and outputs
    • Three Programmable 0-5V Sensor Inputs for Oil/Fuel/Dome or Nitrous Pressure Sensors
    • Six Programmable Ground Outputs
    • One +5v Reference Output - +5V Power Supply for 0-5v Sensors
    • One Sensor Ground – Ground supply for 0-5v Sensors
    • Air entry is machined to fit most stock-style air cleaners with air cleaner locator provisions.
    • Only 4 Wiring Connections Required! (Battery +, Battery - , Switched Ignition & RPM)
    • External fuel pressure regulator required, set to a base pressure of 58.5 PSI, such as12-882.
    • Integrated ignition timing control
    • High-Resolution Full Color Touchscreen for Initial Setup, Tuning, and Gauge Displays
    • 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!
    • Self-tuning ECU means you don’t have to be a computer/tuning wiz to have EFI!
    • The included Genuine Bosch LSU 4.9 Wideband Oxygen Sensor provides realtime Fuel Map Learn!
    • OEM Style TPS/IAC and Fuel Pressure regulator, for years of dependable service.
    • Available in 3 finishes: Shiny, Black and coming soon, Gold
    • Included clamp-on oxygen sensor kit for 2.25" exhaust ensures a leak-free oxygen sensor installation, with Stainless Steel T-Bolt clamps and a Stainless Steel (Weldable) oxygen sensor flange


    CARB Warning

    For race/ off road use or for use on pre-1966 vehicles.

    Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway, or if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

    Holley Sniper 550-876 Specifications

    MFG. Part #550-876
    BrandHolley Sniper
    Injection StyleThrottle Body
    CFM870 CFM
    Injector Size100 lbs./hr.
    Max Horsepower Rating1250
    ECM IncludedYes
    Speedway Motors Catalog Part #425-550876
    Carburetor Flange Type4-Barrel Square Bore
    User TunableYes
    Self TuningYes
    Injectors IncludedYes
    Intake Manifold IncludedNo
    Metering StyleSpeed density
    Throttle Body IncludedYes
    Throttle Body MaterialCast Aluminum
    Throttle Body FinishPolished
    Venturi Quantity4
    Fuel Pump IncludedNo
    Fuel Rails IncludedNo
    Calibration Module IncludedYes
    Wiring Harness IncludedYes
    Fuel Pressure Regulator IncludedNo
    Distributor IncludedNo
    MAP Sensor IncludedYes
    IAC Motor IncludedYes
    IAT Sensor IncludedYes
    TPS Sensor IncludedYes
    Use with Power AdderYes
    GTIN Code090127077887
    Sold in QuantityKit