The Sniper 2 EFI Black Base Kit is a self-tuning fuel injection conversion for common 4150-flange, 4-barrel carbureted engines, sold without a fuel system for installers who already have compatible fuel delivery in place. It carries forward everything Holley learned from the original Sniper EFI system, adding a redesigned ECU, updated wiring harness, and a range of tuning displays, so a classic drives like a modern fuel-injected vehicle with easier cold starts, smoother drivability, and better fuel economy. It installs at home with limited tools, and the setup wizard begins self-tuning after a few basic questions, 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: Not included, use with an existing compatible fuel supply
- 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-BXX
This Base Kit is intended for installers who already have a compatible EFI-rated fuel system in place, and is part of the larger Sniper EFI Ecosystem that includes Hyperspark ignition, complete fuel systems, and multiple display options sold separately.
FAQ
Does the Base Kit include a fuel pump or fuel system?
No. The Base Kit does not include a fuel system, it's intended for installations where a compatible EFI-rated fuel supply is already in place.
What vehicles is this 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.
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.
What injectors does this kit use?
Four 100 lb/hr injectors at 58.5 PSI, supporting up to 650 hp naturally aspirated.
