You install the kit just as normal. It does mute the radio and instead of using the little speaker that comes with the hands-free kit, the signals are routed back into the radio and it works like the OnStar.
You do have to run a separate mic though. There is a power wire, ground wire, mute wire and then the 2 speaker wires and that is all you connect. The adapter hooks inline with the stock wiring harness and there is no splicing to the stock harness. The adapter can be removed as though it was never there.
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