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By removing the factory system you lose the ability to have the sub. the second plug is for the amplifier, at least that is what I am lead to believe. The back of your new headunit has the plug sitting there in the picture, you have to hook the Metra plug to the factory plug, take the wires and hook them to the plug from your new one. You still have to hook wires together, but you dont have to cut the factory wires. Its not hard to connect those wires up, it should have all the color codes for you.
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