I bought the my cd nav HU whole (inc lcd panel) 2nd hand (ebay) for £350, and then sold the tape unit for £280...

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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.