W'hoo, glad it's all working my friend.

Try extending the BT antenna into the cab, the OEM is only a short lead, replace it with the longer (4m) one from the e46, BMW p/n 61-12-6-912-541, and route into the cabin.

Any where under the centre console should be fine (or the glovebox).

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.