Mercedes Fiber System Bypass CableMost Mercedes Benz Porsche come with factory fiber optics audio system. The audio signal is not the same as aftermarket head unit. In this case, there will be no audio at all after install the aftermarket navigation head unit. And you need this product. One end connects to the aftermarket head unit, and another end connect to the amplifier plugs in the trunk. This product include a six meters audio power cable and a six meters FM AM antenna adapter
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