Holley EFI Systems Wiring Harnesses 558-203

Name: Holley EFI Systems Wiring Harnesses
Brand: Holley
SKU: HLY-558-203
Price: 225.95 USD
Availability: InStock
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Part Number: HLY-558-203

$225.95

Holley EFI Systems Wiring Harnesses

Fuel Injection System Wiring Harnesses, Holley EFI, 6 Cylinder, MPFI, SFI, TBI, Injector Harness, for HP, Dominator EFI Systems, Universal, Each
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Holley EFI Systems Wiring Harnesses 558-203

HLY-558-203

Not Yet Reviewed

Part Number: HLY-558-203

Estimated Ship Date: Oct 19, 2026

$225.95

Overview

Applications

Q&A

Instructions & Calculators

Estimated Ship Date: Oct 19, 2026 Would you rather pick it up?

Overview

Brand:

Holley

Manufacturer's Part Number:

558-203

Part Type:

Fuel Injection System Wiring Harnesses

Product Line:

Holley EFI Systems Wiring Harnesses

Summit Racing Part Number:

HLY-558-203

UPC:

090127666470

Fuel Injection Style:

Multi-port

Metering Style:

Speed density

Quantity:

Sold individually.

Notes:

Universal 6-cylinder injector harness designed for use with the HP EFI and Dominator EFI systems.

Holley EFI Systems Wiring Harnesses

Holley offers a variety of direct replacement EFI wiring harnesses, including multi-port, sequential, and throttle body injection styles. These units are made with premium components to ensure better reliability and performance for your ride--and they're compatible with many engine swaps. Holley EFI systems wiring harnesses are sold individually or as a kit; choose the model needed for your fuel injection application.

Applications