Holley Sniper 2 EFI Self-Tuning Master System 4 Barrel (4bbl) 550-511-3XK

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. Like all Sniper EFI systems, Sniper 2 is designed to work with the Sniper Ecosystem that includes Hyperspark ignition, complete fuel systems, multiple user interfaces/dash displays, and more.

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.

New for Sniper 2 is the optional Power Distribution Module (PDM). This cost-effective and optional accessory isolates the core of your EFI and ignition wiring into one, easy-to-use location. Simply slide the stripped wire ends under the positive lock connector and tighten down the set screw. Battery and a switched 12-volt source is all that's required from your vehicle to power the PDM and your 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.

Main Features

• 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

 

Sniper 2 is Part of the Sniper EFI Complete Ecosystem

• Sniper 2 is compatible with the complete Sniper EFI Ecosystem that includes plug-n-play Hyperspark Ignition systems (coil, ignition box and distributor), fuel systems (fuel lines, fuel pump hangers), multiple displays and more
• (NEW) Main harness includes plug-and-play HyperSpark distributor support, for integrated timing control, making your ignition setup hassle free
• (NEW) Adaptors for other ignition types sold separately: 558-329 CD Box to Sniper 2, 558-330 MSD Pro Billet / Crank Trigger to Sniper 2
• (NEW) Wide Variety of tuning and gauge display interfaces: from a 3.5-inch full color LCD Handheld, 5-inch Digital Dash, or the Bluetooth dongle, which allows you to connect either an iOS or Android based cell phone to your Sniper 2
• (NEW) Optional Power Distribution Module (PDM) further simplifies wiring, especially when used in conjunction with an ignition system
• Available with fuel system kits: a complete fuel system consisting of: 20 ft. of 3/8 in. Vapor Guard Fuel Hose, Fuel Pump, fuel pressure regulator, filters, necessary hardware, and bulkhead fitting to return fuel into the tank

 

Additional Features

• (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
• Patent Pending

 

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).

 

• 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)
• Black Finish
• 58.5 PSI
• 4 wire vehicle connection (Battery +, Battery - , Switched Ignition & RPM)
• Integrated fuel pressure regulator
• Integrated ignition timing control & coil driver (requires Hyperspark Distributor)
• 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
• Linkage Adapter Kits Available Here
• Machined, Assembled & Tested in the USA (with 1 part from Canada, and the balance from the USA)