You can only have 1 sky (for both day/night), so it's a compromise between day and night modes.

If you do a lot (over 70%) of your driving at night then its an option, i suppose.

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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.