It does come with a harness you can use but if you were to get the boomslang harness it plugs right in without cutting into your stock harness. To tune the Emanage all you need is the support tool and a lap top computer. You can tune, tune and tune some more with more mods you add.
*Note: you do want to have knowledge on tuning before you start changing settings. You may cause harm to your engine*
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