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    Sale!

    Holley Terminator Throttle Body Injector Upgrade Harness, 205 lb/hr Kit | 558-439

    Vendor: Holley EFI
    Part Number: 558-439
    Save $34
    Sale Price $265.95 Regular Price $299.95

    Available to order. In-stock orders typically ship in 1 to 2 business days.

    Not sure it fits your vehicle?
    Email sales@berryperformancesales.com with your year, make, model and engine, and we'll help you check fitment before you order.
    Fast Fulfillment: In-stock orders typically ship within 1 to 2 business days.
    Free Shipping on Orders Over $99 | Excludes freight shipments
    International Shipping Available: email sales@berryperformancesales.com for a quote.
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    This injector upgrade harness is designed for Terminator throttle body systems, built to be plug-and-play with Holley's 205 lb/hr injector upgrade kit.

    Specifications:

    • Product Type: Terminator Throttle Body Harness
    • Designed for use with 205 lb/hr Injector Upgrade Kit (Part Number 522-205)
    • Part Number: 558-439

    Note: This harness does NOT fit the Terminator Stealth Throttle Body.

    Compliance: This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).

    FAQ

    What is the 558-439 harness designed for?

    It's an injector upgrade harness built to be plug-and-play with Holley's 205 lb/hr injector upgrade kit, Part Number 522-205, on Terminator throttle body systems.

    Does this harness fit the Terminator Stealth Throttle Body?

    No, this harness does not fit the Terminator Stealth Throttle Body.

    Is this harness street legal?

    No. It's legal for Racing Use Only vehicles and cannot be installed on an emissions-controlled street vehicle.

    Shipping Policy
    • Free shipping on orders over $99 (excludes freight shipments).
    • In-stock orders typically ship within 1 to 2 business days. Weekend and holiday orders are processed the next business day.
    • Orders ship from Defiance, Ohio and a nationwide network of warehouses and manufacturers.
    • Items showing an ETA are not in stock yet. ETAs come from the manufacturer and can change.
    • No P.O. Boxes. International orders need a shipping quote, so email us first.

    Read the full Shipping Policy

    Return Policy
    • 30-day return window from the ship date. Returns must be approved first; email sales@berryperformancesales.com with your order number.
    • Items must be unused, complete and in the original packaging.
    • A 20% restocking fee applies, and return shipping is paid by the buyer.
    • Not returnable: installed or modified parts, opened or used programmers and tuners, custom orders, Open Box, and Clearance or Final Sale items.
    • Damaged, defective or incorrect items must be reported within 48 hours of delivery with photos.

    Read the full Return Policy

    Disclaimer

    All products are sold for off-road use only unless otherwise specified. Buyer assumes all responsibility for installation and operation. Seller is not liable for any incidental, indirect, or consequential damages — including engine failure, labor costs, or vehicle downtime — resulting from the use of any product sold.

    By making a purchase from Berry Performance Sales, you acknowledge and agree to abide by the terms and conditions of these Policies.

    For any questions or concerns, please contact us — we’re always happy to help.

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