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Holley EFI

Pro-Jection E-Prom

Pro-Jection 4 DI MPFI E-Prom

Part # 534-117 Be the first to write a review
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Pro-Jection 4DI MPFI E-Prom


  • E-prom chip.

About Holley EFI

Holley is the new standard in EFI! Whether you're engine swapping your classic car or need to manage 4000 horsepower in your twin-turbocharged drag radial race car, Holley EFI has the solutions you need to get your project up and running better than ever!

Brand Holley EFI
Emission Code5
Product TypePro-Jection Service Part
Part Number534-117

This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

To download the latest software: 1. Type in (or go to the top of this screen adn click "Technical", then "Resource Documents and Downloads") and scroll down to "Fuel Injection". Click on "Pro-Jection 4Di Tuning Software". It will ask you to "Open" or "Save". Click "Open" and you will see a folder named "4Di Software". Click on this and look for a pdf file named "Instructions to Download". (If you do not have Adobe Reader, you can download it free at Follow these instructions to complete the download. 2. The software is now installed.

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    *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages.

    Some parts are not legal for use in California or other states with similar regulations.

     X  Holleydays 2021
     X  Holleydays 2021