Holley Sniper 2 EFI – Self-Tuning Kit – Black 550-511-3XX

Description

Description:

The Holley Sniper 2 EFI Self-Tuning Kit Black 550-511-3XX is part of Holley’s Sniper EFI lineup, designed to modernize classic carbureted engines with electronic fuel injection technology. This system replaces a traditional carburetor with a throttle-body EFI unit that integrates fuel injectors, sensors, and an electronic control unit (ECU).

Unlike older carburetor systems that require manual tuning, the Sniper EFI platform automatically adjusts fuel delivery using data from engine sensors. The system monitors factors such as engine temperature, throttle position, air intake conditions, and oxygen sensor feedback to maintain optimal air-fuel ratios.

This allows classic vehicles and performance builds to benefit from modern fuel injection performance while maintaining compatibility with many V8 engine platforms.

Where This System Is Used

The Holley Sniper 2 EFI Self-Tuning Kit Black 550-511-3XX is commonly installed on vehicles originally equipped with carburetors.

Typical applications include:

• classic muscle cars
• hot rods and custom builds
• classic trucks
• street performance vehicles
• carbureted V8 engine upgrades

The system is designed to fit standard 4150-style carburetor flanges, making it compatible with many popular intake manifolds used on small-block and big-block engines.

Fuel Injection Performance and Benefits

The Holley Sniper 2 EFI Self-Tuning Kit Black 550-511-3XX improves engine operation by replacing carburetor fuel delivery with electronically controlled fuel injection.

Key performance features include:

• self-learning fuel injection control
• integrated throttle body injectors
• wideband oxygen sensor feedback
• electronic ECU control system
• improved cold starting performance

Electronic fuel injection systems provide more precise fuel delivery than carburetors, allowing engines to operate more efficiently across different driving conditions.

This can improve throttle response, fuel economy, and overall engine drivability.

Why This EFI System Is a Popular Choice

Performance builders frequently choose the Holley Sniper 2 EFI Self-Tuning Kit Black 550-511-3XX because it simplifies the process of converting carbureted engines to fuel injection.

Advantages include:

• automatic self-tuning fuel control
• simplified installation compared to traditional EFI systems
• improved engine starting and idle stability
• modern electronic fuel delivery technology
• compatibility with many V8 engine platforms

Because the system automatically learns and adjusts fuel maps, users typically do not need extensive tuning experience to operate the system successfully.

Who This Product Is Best For

The Holley Sniper 2 EFI Self-Tuning Kit Black 550-511-3XX is designed for vehicle owners and builders who want to upgrade carbureted engines with modern fuel injection technology.

Typical buyers include:

• hot rod builders
• muscle car restoration specialists
• performance engine builders
• automotive tuners
• mechanics upgrading classic engines

For classic vehicles that originally used carburetors, installing a Sniper EFI conversion kit can improve reliability and engine performance.

Key Specifications

The Holley Sniper 2 EFI Self-Tuning Kit Black 550-511-3XX includes components designed to support electronic fuel injection upgrades.

Key specifications include:

• system type: throttle body electronic fuel injection system
• finish: black anodized finish
• ECU type: self-learning electronic control unit
• injector configuration: integrated fuel injectors
• mounting flange: 4150 carburetor style flange
• fuel pressure requirement: approximately 58 PSI
• oxygen sensor: wideband O2 sensor included

These specifications allow the system to support modern EFI operation while maintaining compatibility with traditional carbureted intake manifolds.

The #1 EFI conversion system just got better! Introducing Sniper 2 EFI – a self-tuning, easy-to-install, EFI conversion for common 4-barrel (4150 flange) style carburetors. We took everything that we learned from the original Sniper EFI system and added 14 new features that will make your EFI conversion more simple, reliable, and modern.  Battery and a switched 12-volt source is all that’s required from your vehicle to power the Sniper EFI. Make your classic drive like a modern fuel-injected vehicle, including easy cold starts, smooth drivability, and improved fuel economy! Sniper 2 is designed to be installed at home in your garage with limited tools and the support of Holley’s comprehensive installation manual and videos. The user-friendly setup wizard allows you to answer a few simple questions about your engine and the system will begin self-tuning with no laptop or tuning experience required. If you’re looking for a high-performance fuel injection system that delivers power, efficiency, and ease of use, look no further than the Sniper 2 EFI.

Features and Benefits:

All new design – the #1 EFI Conversion just got better!
Only four wiring connections required: Battery+, Battery-, Switched Ignition, and RPM
Calibration wizard only requires that you answer a few simple questions about your engine to create a base map and begin self-tuning – No laptop required
Supports up to 650hp naturally aspirated or 575hp on boost with four 100 lb/hr injectors
(NEW) Next generation ECU features improved RF noise and interference resistance (stands up to old car wiring, noisy alternators, faulty plug wires)
(NEW) Redesigned throttle shaft and plate geometry for a smoother throttle feel
(NEW) Integrated transmission kick down provisions for GM TH350/400, 200-4R/700R4 and Ford C4/C6 applications
(NEW) “Hidden Harness” wiring harnesses exits from the rear of throttle body for a clean appearance
(NEW) Inputs and outputs consist of: 2x Ground Inputs, 2x Ground Outputs, 1x TPS output (0-5v), and 1x Tach Output
(NEW) Redesigned injector connector for improved reliability
(NEW) Onboard contactless magnetic TPS sensor ensures an accurate TPS reading
(NEW) Next Generation mil-spec style M8 positive lock connector for CAN1 and CAN2 provides the latest in CAN bus technology for a simple yet robust connection
(NEW) Cast-in fuel crossover from the primary to secondary fuel rail
(NEW) Sniper 2 throttle bodies are serialized in house, which provides each unit a birth certificate for an improved customer service and warranty experience in the event of any unit needing to be inspected
The included genuine Bosch LSU 4.9 wideband oxygen Sensor provides real-time fuel map learning
Included clamp-on oxygen sensor kit ensures a leak free oxygen sensor installation with stainless steel T-Bolt clamps and a stainless steel weldable oxygen sensor flange
Previous Manufacturer Part #: 550-511
New Manufacturer Part #: 550-511-3XX
Flange: Square Bore
Finish: Black

Frequently Asked Questions

1. Does this kit replace a carburetor directly?

Yes. It is designed to mount to standard 4-barrel intake manifolds in place of a carburetor.

2. Is this system self-tuning?

Yes. The integrated ECU continuously adjusts fuel delivery based on real-time sensor data.

3. Does this require laptop tuning?

Basic setup can be completed without complex laptop tuning, depending on configuration.

4. Is this suitable for daily street use?

Yes. It is engineered for street-driven vehicles seeking improved reliability and drivability.

5. Can this system improve cold starts?

Yes. Electronic fuel control improves cold start consistency compared to traditional carburetors.

6. Does this work on all engines?

It is compatible with engines using a standard 4-barrel intake manifold and appropriate fuel system support.

NOTE: Must run 58-60 PSI EFI Return style regulator and EFI pressure gauge for best results.
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