The Holley Sniper 2 EFI Return-Style Drop-In Module kit brings self-tuning fuel injection to common four-barrel, 4150-flange carbureted engines. This polished kit pairs the Sniper 2 throttle body with a 5 in. color LCD handheld display and a universal drop-in fuel module that mounts inside the tank and supplies fuel back to a return-style regulator setup.
Key Features:
- Redesigned throttle shaft and plate geometry for a smoother, more linear throttle feel
- Next-generation ECU with improved RF noise and interference resistance for reliable operation on older vehicle wiring
- Includes a genuine Bosch LSU 4.9 wideband oxygen sensor for real-time fuel map learning
- Onboard contactless magnetic TPS sensor for accurate, drift-free throttle position readings
- Cast-in fuel crossover from the primary to secondary fuel rail
- Mil-spec style M8 positive-lock connectors for CAN1 and CAN2 provide a robust wiring connection
- "Hidden Harness" wiring exits from the rear of the throttle body for a clean installation
- Only four wiring connections required: Battery+, Battery-, Switched Ignition, and RPM
- Built-in calibration wizard builds a base fuel map from a few simple engine questions - no laptop required
- Integrated transmission kickdown provisions for GM TH350/400, 200-4R/700R4 and Ford C4/C6 applications
- Included clamp-on oxygen sensor kit with stainless T-bolt clamps and a weldable O2 sensor flange for a leak-free install
- Each throttle body is individually serialized for streamlined customer service and warranty support
- Sold without the Power Distribution Module (PDM); available separately for a simplified wiring option
- Universal drop-in fuel module rated at 340 LPH for return-style fuel systems
Specifications:
- Flange Style: 4150
- CFM: 800
- Fuel Pressure: 58.5 PSI
- Fuel Pump Flow Rating: 340 LPH
- Injector Size: 100 lb/hr @ 58.5 PSI
- Inlet/Outlet Size: 9/16-18 Female O-Ring (AN 6)
- MAP Sensor: 2 Bar
- Max Horsepower Rating: 650 naturally aspirated / 575 boosted
- Finish: Polished
- User Interface: 5 in. Handheld
- Power Distribution Module: No
- Transmission Compatibility: All
- Part Number: 550-510-5XR
Nitrous control is not supported in Sniper 2 EFI software.
FAQ
What engine and carburetor flange does this kit fit?
It's designed for common four-barrel, 4150-flange carbureted engines and supports up to 650 hp naturally aspirated or 575 hp under boost with the included four 100 lb/hr injectors.
Do I need a laptop or tuning experience to set it up?
No. The 5 in. handheld's calibration wizard asks a few simple questions about the engine, builds a base fuel map, and the system continues to self-tune from there.
What fuel delivery style does this kit use?
It uses a universal drop-in fuel module (340 LPH) designed for return-style fuel systems, mounted inside the tank.
Does this kit include the Power Distribution Module?
No. This version is sold without the PDM; it's available separately.
Is nitrous control supported?
No, nitrous control is not supported in Sniper 2 EFI software.
