The Holley Sniper 2 EFI is a self-tuning fuel injection conversion for common 4150 four-barrel carburetors. It builds on the original Sniper EFI with 14 new features and lets a classic drive like a modern fuel-injected vehicle, with easy cold starts, smooth drivability, and improved fuel economy. A setup wizard asks a few questions about the engine and then self-tunes with no laptop or tuning experience required, and the system is designed to be installed at home with limited tools using Holley's manuals and videos.
Key Features:
- Self-tuning 4150 four-barrel EFI conversion with a guided setup wizard
- 14 new features over the original Sniper EFI
- 800 CFM throttle body supporting up to 650 HP naturally aspirated
- Works with the Sniper ecosystem: HyperSpark ignition, fuel systems, and dash displays
- Installs at home with limited tools, no laptop required
- Includes the optional Power Distribution Module (PDM) to consolidate EFI and ignition wiring
- Includes a universal drop-in in-tank fuel module rated at 340 LPH
Specifications:
- Flange: 4150 four-barrel
- Airflow: 800 CFM
- Injectors: 100 lb/hr at 58.5 PSI
- Fuel pressure: 58.5 PSI
- MAP sensor: 2 Bar
- Max horsepower: 650 naturally aspirated
- Fuel system: universal drop-in in-tank module, 340 LPH
- Power Distribution Module (PDM): included
- Height: 3.28 in
- Inlet/outlet: 9/16-18 female O-ring (AN 6)
- Finish: black
- Part number: 550-511-3PR
FAQ
What carburetor does the Sniper 2 EFI replace?
It replaces a common 4150 four-barrel carburetor with a self-tuning EFI system.
What is included in the 550-511-3PR kit?
It includes the Sniper 2 EFI throttle body, a Power Distribution Module, and a universal drop-in in-tank fuel module rated at 340 LPH.
How much power does it support?
The 800 CFM throttle body supports up to 650 HP naturally aspirated.
What does the Power Distribution Module do?
It isolates the EFI and ignition wiring into one location; stripped wire ends lock under a set screw and only battery and a switched 12-volt source are needed to power it.
Do I need a laptop to tune it?
No. A guided setup wizard self-tunes the system with no laptop or tuning experience required.
