EFI Retrofit Kits

Introducing the Holley Sniper EFI Self-Tuning Master Kit in a sleek Black Ceramic Finish. Holley has made electronic fuel injection more accessible than ever with this revolutionary product. Designed to fit 4150 Flange & Spread Bore manifolds, this kit offers a dual pattern bolt-on carburetor replacement with a throttle body-mounted ECU—eliminating the need for extra boxes. Capable of supporting up to 650hp with just four wiring connections required, it simplifies installation and offers a complete fuel system including 20ft of 3/8” Vapor Guard Fuel Hose, a fuel pump, filters, and necessary hardware. The high-resolution full-color touchscreen facilitates easy setup, tuning, and gauge displays, while the self-tuning ECU handles calibration effortlessly. Experience the future of EFI with Holley Sniper—bringing EFI within reach for everyone.

Upgrade your ride's performance with the Holley Sniper Stealth 4150 Master Kit in a sleek shiny finish. This top-notch EFI system by Holley EFI is packed with 4, 100LB/HR Fuel Injectors, supporting up to 650 HP naturally aspirated or 600 HP with forced induction. Enhancing your vehicle’s functionality, the Sniper Stealth 4150 ECU offers self-learning fuel maps and ignition timing control for smoother idle stability and increased horsepower. Ideal for GM TH350/400, 200R4/700R4 and Ford C4/C6 applications, this master kit includes a full fuel system, featuring an external fuel pressure regulator, 20ft of Vapor Guard Fuel Hose, filters, and all necessary hardware for installation. With only four simple wiring connections and a high-resolution touchscreen for easy setup, you’ll enjoy hassle-free tuning and quick performance boosts. No extensive tuning knowledge required! Experience seamless power and precision with the Sniper Stealth 4150.