Did a google search relating to the CPU. Found this instead. It almost looks like its plug n play. It must talk to the IBUS.

Anyone buy one of these yet? Dynavin E46 Radio

I understand that this will not replace the NAV in the E83 and is specifically for the E46 and not everyone that has an E83 also has an E46.

dynavin

This is a custom E46 style GPS HU. Looked over threads from V1 to current V5. Sounds impressive. Looks plug n play. With this in place would most likely take the CarPC out.

Dynavin Frequently Asked Questions....READ First - E46Fanatics

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E83 - Aero PKG Mods installed: Homelink mirror. CIS-IBUS video module, AUX, Rr Dr Release, stock wheels, Remote start, CarPC (Atom) & mud flaps - NAV - MKIV - NA Map DVD - 2011
E46 - 18.5 wheels/tires (summer), 17 stock (winter), Homelink, NAV software upgrade, BMW video module, Radio to V53, AUX, USB IBUS interface,BMW alarm install, CarPC(Epia), remote starter, tank battery & angel eyes. NAV - MKIII - NA Map CD - High Version 2008.1