Description
ADVANCED EFI CONVERSION. The Holley Sniper 2 EFI with Return Style Drop-In Module; Black is a self-tuning electronic fuel injection system designed to replace traditional carburetors on 4-barrel (4150 flange) style setups. It offers enhanced engine management through integrated self-tuning technology and customizable user interfaces, helping modernize classic engine performance.
CONSTRUCTION AND APPEARANCE. This system features a robust throttle body finished in sleek black with a shiny surface, ensuring durability and a polished look. The harness wiring routes discreetly through a hidden rear exit and incorporates a mil-spec style M8 connector for advanced CAN bus communication, supporting a modern and reliable electronic architecture.
INSTALLATION. Installation is user-friendly, requiring connection to battery and switched 12-volt sources if the optional Power Distribution Module is used. This bolt-on conversion maintains vehicle integrity without the need for complex modifications.
WARRANTY. This product includes a standard two-year warranty with an option to extend coverage through product registration.
APPLICATION. Fits universal applications; some adaptation may be required depending on specific vehicle setup and use case.
Holley 550-511-3XR
CA Residents: WARNING: Cancer and Reproductive Harm
- Finish Black, Shiny
- Fuel System Options Include Universal Drop In Module, Master Kit, Universal Returnless Drop In Module
- Hyperspark Ignition Kit Options: No, Chevrolet Big/Small Block Add Cost, Ford Small Block 8.2 Deck Add Cost
- Optional Power Distribution Module Simplifies EFI And Ignition Wiring
- User Interface Includes 3.5 Inch Handheld, 5 Inch Handheld Add Cost, Bluetooth Module Deduct Cost
- Return Style Drop-In Module Without Power Distribution Module With 3.5 Inch Handheld Display
- Emissions Legal For Use On Uncontrolled Non-Emissions Controlled Vehicles
- Features Include Hidden Harness Wiring Exit, Optional Power Distribution Module, Calibration Wizard For Base Map And Self-Tuning, Compatibility With Complete EFI Ecosystem
- Incorporates M8 Mil-Spec Style Connector For CAN Bus Technology And Integrated Transmission Kick Down Provisions
- Uses Genuine Bosch LSU 4.9 Wideband Oxygen Sensor For Real-Time Fuel Map Learning
- Wide Variety Of Tuning And Gauge Display Interfaces Available
- Cast-In Fuel Crossover From Primary To Secondary Fuel Rail
- Supports Up To 650 Horsepower Naturally Aspirated Engines
- Fuel Pressure Rated At 58.5 PSI And Maximum Airflow Of 800 CFM
- Part Type Fuel Injection Conversion Kit
- Fits Universal; Some Adaptation May Be Required For Specific Applications
| Brand | Holley |
| Throttle Body Type | Cable |
| Throttle Body Diameter | N/A |






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