I'm using the external mic that came in the box, works fine although i haven't positioned it in its final resting place (a pillar). Right now it's sitting under the steering wheel, sticking out of the leather steering cover.

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BMW X5 E53, 4.8iS - 2005
Professional Stereo/Nav with DSP (modified BM54 module) - Converted to Eonon GA5166X with Reverse cam
4-Corner Air Suspension - Converted to BC Coilovers