The Sniper 2 EFI Black Inline Master Kit is a self-tuning fuel injection conversion for common 4150-flange, 4-barrel carbureted engines. Built on everything Holley learned from the original Sniper EFI system, Sniper 2 adds a redesigned ECU, a next-generation wiring harness, and a wide range of tuning displays, letting a classic drive like a modern fuel-injected vehicle with easier cold starts, smoother drivability, and improved fuel economy. It's designed to be installed at home with limited tools, and the guided setup wizard begins self-tuning after a few basic questions about the engine, with no laptop required.
Key Features:
- Redesigned injector connector for improved reliability
- Calibration wizard builds a base map and begins self-tuning from a few simple engine questions, no laptop required
- Optional Power Distribution Module (PDM) available separately to further simplify wiring alongside an ignition system
- Main harness includes plug-and-play HyperSpark distributor support for integrated timing control
- Choice of tuning and gauge display interfaces: 3.5-inch full color LCD handheld, 5-inch digital dash, or the included Bluetooth module for iOS/Android
- Adaptors for other ignition types available separately (558-329 CD Box, 558-330 MSD Pro Billet/Crank Trigger)
- Next-generation ECU with improved RF noise and interference resistance
- Integrated transmission kickdown provisions for GM TH350/400, 200-4R/700R4 and Ford C4/C6
- Only four wiring connections required: Battery+, Battery-, Switched Ignition, and RPM
- Next-generation mil-spec style M8 positive lock connector for CAN1 and CAN2
- Onboard contactless magnetic TPS sensor for accurate throttle position readings
- Cast-in fuel crossover from the primary to secondary fuel rail
- Included clamp-on oxygen sensor kit with stainless steel T-bolt clamps and a weldable O2 sensor flange
- Genuine Bosch LSU 4.9 wideband oxygen sensor for real-time fuel map learning
Specifications:
- Flange Style: 4150
- CFM: 800
- Max Horsepower Rating: 650 naturally aspirated
- Injector Size: 100 lb/hr @ 58.5 PSI
- Fuel Pressure: 58.5 PSI
- Fuel System: Inline Fuel System Master Kit, 240 LPH fuel pump
- MAP Sensor: 2 Bar
- User Interface: Bluetooth Module
- Inlet/Outlet Size: 9/16-18 Female O-Ring (AN 6)
- Finish: Black
- Transmission Compatibility: All
- Part Number: 550-511-BXK
This Master Kit includes a complete inline fuel system (fuel hose, pump, pressure regulator, filters, and bulkhead fitting) in addition to the throttle body and harness, and is part of the larger Sniper EFI Ecosystem that includes Hyperspark ignition and multiple display options.
FAQ
What vehicles is the Sniper 2 EFI Black Inline Master Kit designed for?
It's built as a self-tuning EFI conversion for engines currently running a 4150-flange 4-barrel carburetor, supporting up to 650 hp naturally aspirated.
Does this kit include a fuel system?
Yes. The Inline Master Kit includes a complete inline fuel system with a 240 LPH fuel pump, hose, filters, pressure regulator, and hardware.
What tuning interface comes with this kit?
It includes the Bluetooth Module, allowing wireless monitoring and tuning from an iOS or Android phone. A 3.5-inch LCD handheld and 5-inch digital dash are available separately.
How many wiring connections does installation require?
Only four: Battery+, Battery-, Switched Ignition, and RPM signal.
Is a Power Distribution Module included?
No, the PDM is an optional accessory sold separately that further simplifies wiring, especially alongside an ignition system.
What injectors does this kit use?
Four 100 lb/hr injectors at 58.5 PSI, supporting up to 650 hp naturally aspirated.
