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C950 upgrade confusion, 550-604 or 554-113?

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  • Danny Cabral
    replied
    The Holley 554-113 is just the HP ECU. You need the Holley 550-604 HP EFI ECU & Harness Kit.

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  • makemeknowit
    started a topic C950 upgrade confusion, 550-604 or 554-113?

    C950 upgrade confusion, 550-604 or 554-113?

    I have an '85 Mustang GT that has been fitted with a Commander 950 prior to my purchase. Tuning the 950 is a complete nightmare. Considering ditching it all and going back to carb setup. Another consideration was upgrading to HP, but I'm not clear on what's required to do so, 550-604 or 554-113. Thanks.
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