Holley Sniper 2 EFI Self-Tuning Fuel Injection Systems 550-511-3PK
The #1 EFI conversion system just got even better.
Holley Sniper 2 EFI 550-511-3PK is a self-tuning and easy-to-install EFI conversion for classic 4-barrel (4150 flange) carburetors. The system builds on the success of the original Sniper EFI and has been upgraded with 14 new features that make your EFI conversion simpler, more reliable, and more modern.
Sniper 2 is designed to work together with Holley’s complete Sniper EFI Ecosystem, which includes Hyperspark ignition system, complete fuel systems, multiple display solutions, and much more.
This 550-511-3PK version is supplied as “Inline Pump – With PDM – 3.5 in. Handheld”, i.e., with both an inline fuel pump, Power Distribution Module, and a 3.5" handheld display.
New for Sniper 2 is the optional Power Distribution Module (PDM).
This cost-effective module gathers and isolates the EFI and ignition wiring in one central location. Simply insert the stripped wire ends into the positive lock connector and tighten the set screw. Only a battery and a switched 12V supply are required to power both the PDM and your Sniper EFI.
Make your classic drive like a modern fuel-injected vehicle – with easy cold starts, smooth drivability, and improved fuel economy.
Sniper 2 is developed for installation at home in the garage with limited tools and with support from Holley’s installation manual and video guides. The user-friendly Setup Wizard only requires you to answer a few simple questions about your engine – after which the system starts self-calibration automatically. No laptop or tuning experience is required.
If you want a high-performance EFI system that combines power, efficiency, and ease of use, Sniper 2 EFI is the obvious choice.
Main Features
All new design – the #1 EFI conversion system just got even better
Only four wiring connections required: Battery+, Battery-, Switched Ignition, and RPM
Calibration wizard creates a base map and begins self-tuning – no laptop required
Supports up to 650 HP naturally aspirated or 575 HP with boost via four 100 lb/hr injectors
(NEW) Next generation ECU with improved resistance to RF noise and interference
(NEW) Redesigned throttle shaft and throttle plate geometry for smoother throttle feel
What is included in the kit (550-511-3PK)
Included components (550-511-3PK)
• 4-barrel EFI throttle body (4150 flange / 800 cfm)
• Integrated ECU (engine control built into throttle body)
• 4 pcs. 100 lb/hr high-flow injectors
• 3.5" color Handheld display for setup and tuning
• Complete plug-and-play wiring harness (incl. support for Hyperspark distributor via main harness)
• Power Distribution Module (PDM)
• Wideband Bosch LSU 4.9 O2 sensor
• Clamp-on oxygen sensor kit (T-bolt clamps + weld flange)
• MAP sensor (2 bar)
• TPS sensor (contactless magnetic type)
• IAT sensor
• IAC motor/valve
• External inline high-pressure fuel pump (approx. 240 LPH)
• Fuel pressure regulator
• Fuel filters
• 20 ft. 3/8" Vapor Guard fuel hose (feed and return)
• Bulkhead fitting for return to tank
• Installation hardware and gaskets
Sniper 2 is part of the complete Sniper EFI Ecosystem
Sniper 2 is compatible with the entire Sniper EFI Ecosystem, which includes plug-and-play Hyperspark ignition systems (coil, ignition box and distributor), fuel systems (fuel hoses, pump hangers), multiple display interfaces, and more.
(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 display interfaces: 3.5" color LCD Handheld, 5" Digital Dash, or Bluetooth dongle for iOS and Android
(NEW) Optional Power Distribution Module (PDM) further simplifies wiring
Additional Features
(NEW) Integrated kickdown function for GM TH350/400, 200-4R/700R4, and Ford C4/C6
(NEW) “Hidden Harness” – wiring harness exits from the rear of throttle body for a clean engine bay
(NEW) Inputs and outputs: 2x Ground Inputs, 2x Ground Outputs, 1x TPS output (0-5V), and 1x Tach Output
(NEW) Redesigned injector connector for improved reliability
(NEW) M8 mil-spec positive lock connector for CAN1 and CAN2
(NEW) Cast-in internal fuel crossover from the primary to secondary fuel rail
(NEW) Serial-numbered throttle body for improved warranty and service experience
Patent pending
