The stock wiring is going to be fine for powering the new head unit, I have not only powered the head unit from the stock wiring but the alpine add on amp for thier head units which increases the power from 22 watts to 50 watts. You are fine using the factory wiring.
Now if you were doing a true high quality setup that you were going to spend 6k+ for the system. I would than run a new power wire from the battery to the head unit using a relay.
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