Yeah you can buy something cheap, (I've seen a unit for £40, that will be fine), its just that it needs a remote... the i-bus interface is what the stupid money.

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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.