Fuel Injection Retrofit Kits

Introducing the Holley Sniper EFI 4150 Super Sniper 650! Transform your blow-thru carbureted turbo engine to EFI effortlessly. Ideal for lower horsepower applications, this model supports up to 650 HP with its four injector design. With built-in nitrous control, there's no need for a separate controller, simplifying your setup. Each system includes a USB to CAN tuning cable and free Sniper EFI Software for unparalleled engine control. Holley Sniper delivers powerful performance and is packed with features like advanced boost control, programmable air-fuel ratios, and user-friendly adjustability, making it the ultimate choice for enhancing your engine's capabilities.

Introducing the Holley Super Sniper EFI! Transform your blow-through carbureted turbo engine into a high-performance EFI beast with this cutting-edge system. Designed for up to 650 HP, it features four powerful injectors ideal for lower horsepower applications with power adders or additional sensor needs. The Super Sniper boasts built-in nitrous control, eliminating the need for an additional controller. Plus, enjoy limitless engine control with the free Sniper EFI Software and a USB to CAN tuning cable included. Take your engine to the next level with Holley’s superior performance technology!

Introducing Holley Super Sniper EFI! Transform your blow-thru carbureted turbo engine to EFI effortlessly with the Holley Super Sniper 4150 EFI system. Equipped with 8, 100LB/HR fuel injectors, it supports up to a whopping 1250 HP on forced induction or dry nitrous applications. Even if your setup isn't pushing those numbers, there's a 650 HP four-injector version for lower power needs with a power adder or extra sensor inputs. Plus, no need for a separate nitrous controller—full nitrous control is built right in! Each Super Sniper EFI system includes a USB to CAN tuning cable and free Sniper EFI Software, granting you limitless engine control.

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.

Holley just brought EFI within reach! Introducing the Sniper EFI 2300 Self-Tuning Master Kit in a Shiny Finish! Perfect for vehicles originally equipped with a 2300 Holley Flange, such as Fairlanes, Galaxies, Falcons, Comets, F100s, Javelins, Rebels, Mustangs, Thunderbirds, Cougars, and more. Priced affordably, this kit allows you to enjoy all the benefits of EFI while leaving room in your budget for further upgrades. Easily adaptable to a square flange or Q-jet flange 4bbl intake with a Mr. Gasket adapter. Say goodbye to cold start issues, hesitation, vapor lock, and flooding. Upgrade to Sniper EFI and experience the precision of electronic fuel injection today!

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.