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If you are using a factory harness and are after an easy ECU upgrade, take a look at Haltech Plug 'n' Play Adapter Kits. These adapters plug directly into your Haltech ECU and have a set of factory connectors on the other side which plug straight into the factory harness.
A simple Haltech Plug 'n' Play product that allows you to be up and running in just a few hours.
The quick start guide will walk you through installation of the Haltech Plug 'n' Play adapter into your vehicle.