u cant
the standard headunit doesnt have RCAs poking out the back
but has RCAs going INTO teh stock amp..
the RCAs will produce NO noise from an aftermarket amp..(tried that)
you wil need your self a new headunit .. and all the wiring required to put a new amp in...(RCAs..power.. ground..remote cable) then yeah..
if you disconnect the standard amp.. the standard sub and both standard rears will stop working even when connected to the aftermarket headunit.. its wierd..
hope i helped
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