if you are putting in an aftermarket head unit, run seperate speaker wires. Trust me, its just easier. If you are just wanting to swap out the factory speakers, well, check the impedance. You want one as close to the factory speaker as possible to keep the factory amp happy. If it was me I'd ditch the whole system and buy new speakers and a head unit and just run aftermarket speaker wire. If you are planning to add an amp its a must anyway.
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