Holley Sniper 2 EFI Black 4150 Return-Style Kit w/ 5" Handheld & Drop-In Pump

Upgrading from carburetion to electronic fuel injection can improve drivability, throttle response, fuel economy, and cold-start performance while simplifying tuning for street and performance applications. This Holley Sniper 2 EFI black 4150 return-style kit delivers a complete self-tuning EFI conversion for engines equipped with a 4150 square-bore 4-barrel carburetor flange while combining advanced throttle body EFI technology with a handheld tuning interface and a matched return-style 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
 - Return-style drop-in EFI fuel pump included
 - Black throttle body finish

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

The Sniper 2 system uses an onboard calibration wizard to generate a self-learning base tune after answering a few simple setup questions without requiring a laptop or prior tuning experience. Four integrated 100 lb/hr fuel injectors support engines producing up to 650 horsepower naturally aspirated or 575 horsepower under boost. A fully color, backlit 5" handheld display allows setup, tuning, and real-time monitoring directly from the controller while offering customizable layouts and a built-in GPS speedometer. The included return-style drop-in EFI fuel pump allows excess fuel to return to the tank for precise pressure regulation and consistent fuel delivery. Additional upgrades include redesigned throttle shaft geometry for smoother throttle response, hidden harness routing for a cleaner engine bay appearance, redesigned injector connectors, and a contactless magnetic TPS sensor for accurate throttle position readings. The black finish throttle body provides a clean, understated performance appearance ideal for modern street and performance builds.

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: Black
Control Interface: 5” Handheld Display
Fuel Pump Type: Drop-In EFI Pump
Fuel System Type: Return Style
Power Distribution Module: Not Included

Please Note:
 - This kit does not include a Power Distribution Module (PDM).
 - 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.