550-510-3XK Sniper 2 EFI Conversion Kit w/Inline Fuel Pump Master Kit [Shiny]

Name: 550-510-3XK Sniper 2 EFI Conversion Kit w/Inline Fuel Pump Master Kit [Shiny]
Brand: HOLLEY
SKU: 510-550-510-3XK
Price: 1899.95 USD
Availability: InStock

^$1,899⁹⁵

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Systems w/3.5 in. Handheld

Sniper 2 EFI Conversion Kit

800 cfm

4150 Flange

(4) 100 lb./hr. Injectors

Supports up to 650 Horsepower

Includes:

Shiny Throttle Body
3.50 in. Handheld Interface
Inline Fuel Pump Master Kit

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Find Your Compatible Ignition Distributor Here: Holley Sniper EFI HyperSpark Distributors
Holley 550-510-3XK Sniper 2 EFI Master Kit Includes:
- Sniper 2 EFI Conversion Kit 550-510-3XX
- Fuel System Master Kit 526-14
Holley 550-510-3XK Sniper 2 EFI Master Kit Features:
- Four wire connection: Battery+, Battery-, Switched Ignition, and RPM
- Simple calibration wizard to create a base map and begin self-tuning - No laptop required
- Supports up to 650 horsepower naturally aspirated or 575 horsepower power adder applications
- Integrated kick down provisions for GM TH350/400, 200-4R/700R4 and Ford C4/C6 transmissions
- The wiring harness exits from the rear of the throttle body for a clean, ""hidden"" appearance
- Inputs and outputs: (2) ground inputs, (2) ground outputs, (1) TPS output - 0-5 V, and (1) tachometer output
- Onboard contactless magnetic TPS sensor for accurate reading
- Next-generation ECU for improved RF noise and interference resistance for compatibility with classic car wiring, noisy alternators, or faulty plug wires
- Redesigned throttle shaft and plate geometry for a smoother throttle feedback
- Redesigned injector connector for improved reliability
- Plug-and-play HyperSpark distributor support for integrated timing control
- iOS or Android-based cell phone connection compatibility for a wide variety of tuning and gauge display interfaces
- CAN1 and CAN2 mil-spec-style M8 positive lock connector for the latest in CAN bus technology
- Primary to secondary cast-in fuel rail crossover
- Bosch LSU 4.9 wideband oxygen sensor (O2) for real-time fuel map learning
- Clamp-on oxygen sensor kit for a leak-free oxygen sensor installation
- Compatible with the Sniper EFI Ecosystem including plug-n-play Hyperspark Ignition systems, complete fuel systems, multiple displays, and more
FAQ
Is the Holley Sniper kit worth it?
- Absolutely! The Holley Sniper 2 Kit (550-510-3XK) is a comprehensive master kit, offering advanced features, easy installation, and optimal performance, making it a valuable investment for your engine.
How much HP can a Sniper EFI handle?
- The Holley Sniper 2 EFI in the 550-510-3XK kit is designed to handle up to 650 Horsepower, providing reliable fuel injection support for enhanced engine performance.
Will Holley Sniper EFI increase fuel mileage?
- Yes, the Holley Sniper 2 Kit optimizes fuel delivery and combustion efficiency, potentially improving fuel mileage while boosting overall engine performance.
Do you need a fuel pressure regulator with Holley Sniper EFI?
- No, the Holley Sniper 2 Kit (550-510-3XK) includes a built-in regulator, eliminating the need for an external regulator and simplifying the installation process.

Reliable, Powerful, and Easy-to-Install Throttle Body EFI Conversions

The Holley Sniper 2 EFI Conversion System has 14 updated features over previous kits and is easier to install, more reliable, and modernized to deliver power, efficiency, and self-tuning! Each throttle body system features a 4-barrel 4150 flange-style base, four injectors, and a four-wire connection.

Take your classic carbureted engine into the modern age with Holley Sniper 2 EFI Throttle Body Conversion Kits—designed to deliver the reliability, efficiency, and performance of electronic fuel injection without the complexity. Whether you're building a street cruiser, weekend warrior, or daily driver, the Holley Sniper 2 system makes EFI upgrades straightforward and stress-free.

Built with modern features like integrated diagnostics, self-learning capabilities, and Bluetooth tuning, this EFI system simplifies cold starts, improves throttle response, and maximizes fuel economy. Say goodbye to vapor lock, hard starts, and altitude-related tuning headaches—Sniper 2 adapts on the fly, delivering smooth, consistent performance in any condition.

Each Holley EFI Sniper kit includes a 4-injector throttle body that bolts directly in place of most 4-barrel carburetors, making it a perfect fit for small-block and big-block engines alike. With minimal wiring and no laptop required for setup, you’ll be up and running in no time—thanks to the user-friendly, full-color touchscreen.

Upgrade to a Holley Sniper 2 Master Kit for everything you need in one box: the throttle body, fuel system components, sensors, and harnesses—engineered to work together for seamless installation and operation.

Whether you're after modern drivability or a cleaner engine bay, the Sniper 2 is your go-to EFI solution. Shop Holley Sniper 2 EFI Throttle Body Conversion Kits at JEGS today and experience the power of precision fueling with a factory-fresh feel.

The Holley Sniper 2 EFI Throttle Body Conversion Kits are engineered for enthusiasts who want to upgrade from carburetion to modern electronic fuel injection without sacrificing classic engine bay aesthetics. Designed as a direct throttle body EFI conversion, the Sniper 2 system delivers improved drivability, enhanced throttle response, and more consistent air/fuel control across a wide RPM range. Whether you’re restoring a classic muscle car or modernizing a street performance build, Holley Sniper 2 EFI Throttle Body Conversion Kits provide a streamlined path to reliable, self-learning fuel injection performance.

Switching to an EFI conversion kit can dramatically improve cold starts, idle stability, and fuel efficiency compared to traditional carburetors. For high-torque V8 applications, maintaining precise fuel delivery under load is critical—and the Sniper 2 system is built to meet that demand.

Performance Benefits & Key Features

Holley Sniper 2 EFI Throttle Body Conversion Kits are designed with integrated fuel injectors, advanced ECU technology, and self-tuning capabilities that automatically adjust to your engine’s airflow and performance needs. Performance enthusiasts often prioritize horsepower support capacity, injector sizing, throttle bore dimensions, and compatibility with forced induction or naturally aspirated setups.

The throttle body design fits standard 4-barrel intake manifolds, making installation straightforward for many small block and big block applications. Enhanced fuel atomization and precise electronic control contribute to smoother acceleration and improved torque capacity, especially in modified engines with upgraded camshafts or cylinder heads.

These kits are ideal for street performance builds, pro-touring vehicles, daily drivers, and even light drag racing applications. The system’s self-learning feature reduces the need for extensive manual tuning, allowing builders to focus on performance rather than constant adjustments. Durable construction and high-quality internal components ensure reliable operation in demanding environments.

Fitment, Compatibility & Applications

Holley Sniper 2 EFI Throttle Body Conversion Kits are compatible with a wide range of GM, Ford, and Mopar V8 platforms equipped with standard 4-barrel intake manifolds. Popular applications include Chevrolet Camaro, Chevelle, Nova, Ford Mustang, Dodge Charger, and classic truck builds configured for carbureted setups.

Because the Sniper 2 system is designed as a carburetor replacement, it integrates seamlessly into many restoration and restomod projects seeking modern EFI performance. Proper fuel system upgrades, including high-pressure fuel pumps and compatible lines, are required for optimal results.

If you’re ready to modernize your classic engine with improved drivability and reliable fuel control, explore the Holley Sniper 2 EFI Throttle Body Conversion Kits at JEGS and experience the benefits of advanced EFI technology in your next build.

Part TypeFuel Injection System

Product LineHolley Sniper 2 EFI Throttle Body Conversion Kits

BrandHOLLEY

Package Height9.6

Package Width14.7

Package Length26.7

Weight21.7 PG

Part CategoryPerformance Parts

Wiring Harness IncludedYes

Fuel Pump IncludedYes

Power Adder CompatibleYes

Throttle Body FinishShiny