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The OEM mic is not stereo. It's definitely mono. However, it is inside a module with a small amplifier circuit, which requires 5V power. The signal coming out of that is too loud to use directly with an aftermarket head unit.
Theoretically, you could design a circuit that supplies power to the OEM mic and reduces the level back down to what an aftermarket HU wants, but I haven't heard from anyone yet who has done that successfully. It's not worth the effort, IMHO. Just do like Eman said.
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