Holley Sniper 2 EFI Polished 4150 Returnless Kit w/ 5" Handheld/ Drop-In Pump/ PDM

Converting from a carburetor to electronic fuel injection can improve throttle response, cold starts, and drivability in street performance applications. This Holley Sniper 2 EFI polished 4150 returnless kit provides a complete self-tuning EFI conversion for engines equipped with a 4150 square-bore 4-barrel carburetor flange while combining simplified wiring, handheld tuning control, and a returnless fuel system.

Features and Benefits:
 - Self-tuning EFI conversion system
 - Fits 4150 square-bore flanges
 - Supports 650 naturally aspirated HP
 - Supports 575 boosted HP
 - Four 100 lb/hr injectors included
 - 5” handheld tuning display
 - Full-color, backlit display
 - Power Distribution Mod included
 - Returnless fuel system

Applications:
 - 4150 square-bore 4-barrel carburetor flange

The system uses an onboard calibration wizard that creates a self-learning base tune without requiring a laptop connection. Four integrated 100 lb/hr fuel injectors support engines producing up to 650 horsepower naturally aspirated or 575 horsepower with forced induction. The included color 5" handheld user interface allows setup, tuning, and real-time monitoring directly from the display while offering customizable layouts and a built-in GPS speedometer. The included Power Distribution Module centralizes power and ground connections for cleaner wiring integration, while the returnless drop-in EFI fuel pump maintains consistent fuel pressure without external return plumbing. Additional updates include hidden harness routing, redesigned injector connectors, a contactless magnetic TPS sensor, and revised throttle shaft geometry for smoother throttle response.

Specifications:
EFI System Type: Throttle Body Injection
Carburetor Flange: 4150 Square Bore
Injector Size: 100 lb/hr (x4)
Maximum NA Horsepower: 650 HP
Boost Capability: Up to 575 HP
Finish: Polished
Control Interface: 5” Handheld Display
Fuel Pump Type: Drop-In EFI Pump
Fuel System Type: Returnless
Power Distribution Module: Included

Please Note:
 - Additional fuel system components may be required depending on vehicle configuration.
 - Sniper 2 EFI software does not support nitrous control.
 - Always verify fuel system capacity and application compatibility prior to ordering.