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Professional Grade Holley Efi- 550-617 Hp Efi Ecu & Harness For 99-04 Modular Ford Family Size [QTcAugE1]

$121.99 $390.99 -69%

Holley EFI- 550-617 HP ECU & Harness Kit for 99-04 Modular Ford Are you ready to revolutionize your 1999-2004 Ford Modular 4 Valve engine with cutting-edge technology? Look no further than the Holley EFI- 550-617 HP ECU & Harness Kit. This comprehens

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Professional Grade Holley Efi- 550-617 Hp Efi Ecu & Harness For 99-04 Modular Ford Family Size [QTcAugE1]

Holley EFI- 550-617 HP ECU & Harness Kit for 99-04 Modular Ford

Are you ready to revolutionize your 1999-2004 Ford Modular 4 Valve engine with cutting-edge technology? Look no further than the Holley EFI- 550-617 HP ECU & Harness Kit. This comprehensive plug and play kit is designed to provide you with accurate control over your engine's fuel and ignition, enhancing performance and efficiency like never before. With its wide range of features and easy installation, this kit is the perfect choice for any Ford Modular engine owner looking to upgrade to the latest in automotive technology.

Product Specifications and Technical Details

The Holley EFI- 550-617 HP ECU & Harness Kit is engineered specifically for 1999-2004 Ford Modular 4 Valve engines, ensuring compatibility and seamless integration. This kit features a Jetronic "Bosch Style" injector harness and a Bosch Wideband O2 sensor, providing precise air-fuel ratio monitoring for optimal performance. The kit also includes connectors for Holley Fuel Pressure and Oil Pressure sensors, as well as expanded Inputs and Outputs for future customization. With this kit, you'll have access to all the necessary harnesses and components, including the HP ECU, MAP sensor, Coil Drivers, and more, making it a complete solution for your engine's needs.

Practical Uses and Benefits

Whether you're dealing with a wild cam, power adders, or any other performance challenge, the Holley EFI- 550-617 HP ECU & Harness Kit is up to the task. This kit allows you to accurately control your engine's fuel and ignition, optimizing performance and efficiency. With its plug and play design, installation is quick and straightforward, using your factory sensors and actuators for a hassle-free setup. This kit is ideal for both enthusiasts and professional mechanics looking to upgrade their Ford Modular engines. Say goodbye to outdated systems and hello to the future of automotive performance with the Holley EFI- 550-617 HP ECU & Harness Kit.

What Our Customers Say

January 17, 2026

Absolutely no complaints!

The results speak for themselves. Excellent.

- Finley Z..

January 17, 2026

Absolutely no complaints!

It has a very solid, reassuring feel in the hand.

- Amy Davis.

January 17, 2026

Absolutely no complaints!

The performance is smooth and lag-free.

- Speedy1.

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