Holley HP EFI universal retrofit kits make it easy to install multi-point fuel injection on your Mopar, Ford, or other type engine. Holley Performance universal retrofits are designed for 4150 carburetor-style intakes. HP kits include injector bungs and un-machined fuel rails, so you can modify them to fit any single plane 4-barrel intake manifold. You'll also receive all necessary wiring, ECU, sensors, and a throttle body. Retrofit your engine for maximum performance with complete tunability via your laptop, or opt for self-tuning capabilities and rest assured that your fuel curves are accurate.