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On a MOST setup you will need a new headunit and amplifier and new wiring for all. I think it is possible to just use a new HU and wire your speakers to the HU but it will need to be wired. I bought the HU/Amp/Wiring as a kit and it was almost PnP. It came from CAI-Innovations and was expensive but it just went in and worked. Plenty of DIYs for doing it without the expensive harnesses on the web.
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