558-325 EFI Pro-Billet Ignition Adapter

Name: 558-325 EFI Pro-Billet Ignition Adapter
Brand: HOLLEY
SKU: 510-558-325
Price: 42.10 USD
Availability: InStock

^$42¹⁰

2 left in stock

Ships on Sep 08, 2026

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EFI Harness

EFI Pro-Billet Ignition Adapter

Adapts MSD Pro-Billet Distributors to Holley EFI Main Harnesses

For Use with Terminator X EFI

Holley 558-325 Features:

Designed to plug and play with MSD Pro-Billet distributors and Holley EFI main harnesses with an ignition connector, such as part number 558-104.

Allows for plug and play ignition timing control when utilizing an MSD Pro-Billet distributor.

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART

Part TypeWiring Harness

BrandHOLLEY

Package Height2.4

Package Width2.45

Package Length4.8

Weight0.14 PG

Part CategoryPerformance Parts

Part FitmentSemi Universal

Package Qty1

Package TypeEA

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Please click here to download the instructions PDF file

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

558-325 EFI Pro-Billet Ignition Adapter

Holley 558-325 Features:

⚠️ Warning

Motor Vehicles

Tools

Electrical Cords