The Holley Sniper 2 EFI Returnless 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 the Bluetooth tuning interface and a universal returnless drop-in fuel module.
Key Features:
- Bluetooth module turns an iOS or Android smartphone into a tuning and monitoring interface, with a base map to get started and no laptop required
- 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
- 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
Specifications:
- Flange Style: 4150
- CFM: 800
- Fuel Pressure: 58.5 PSI
- Fuel Pump Flow Rating: 340 LPH
- Fuel System: Universal returnless drop-in module
- 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: Bluetooth Module
- Power Distribution Module: No
- Transmission Compatibility: All
- Part Number: 550-510-BXD
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.
What fuel delivery style does this kit use?
It uses a universal returnless drop-in fuel module rated at 340 LPH, mounted inside the tank.
Does this kit include the Power Distribution Module?
No, this version is sold without the PDM; it's available separately.
Do I need a laptop to tune it?
No. Connect an iOS or Android smartphone via Bluetooth and run the calibration wizard - no laptop required.
Is nitrous control supported?
No, nitrous control is not supported in Sniper 2 EFI software.
