You can on the mk3/mk4 but not the newer ones (i-drive), maybe the dealer could do it, if you can find one that knows his arse from his elbow.

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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.