Retrofitting MMI factory navigation to Audi A4 B8/A5/Q5 (links) (by LoCal)11.1.2010 (updated 7.2.2010) - Without MMI Navigation, what your Audi A4 B8 (or any A5/Q5) has, is radio Chorus/Concert/Symphony which is an MMI-lookalike, but really only a standalone radio.
You could retrofit MMI 2G or MMI 3G with navigation, which is quite a bit of work since it includes removing the radio, adding control panel to the center console, replacing screen and various components. Kufatec.de in Germany will be able to retrofit at least the older MMI 2G, for MMI 3G the currently best place for help is the audiforum.us/mmi but info is scarce still.
So, to start, maybe read these to understand the differences between radio Chorus/Concert/Symphony and MMI 2G and MMI 3G:
Will the real MMI please stand up? Difference between standard radio Concert/Symphony and the optional DVD navigation's MMI controls in B8 platform Audi A4 and A5
Summary of current Audi multimedia systems and history
Then you can read this to understand what retrofitting MMI 2G, also known as MMI High, would entail:
Notes on retrofitting MMI High (Audi A6/A4 B8/A5/Q7)
Then finally, some MMI 3G retrofit links:
Great pictures of Audi A4 B8 MMI 3G retrofit (update 7.2.2010) - thanks to javiii:
Proyecto: Retrofit MMI High 3g, De concert a navegador 3g
Links to MMI 3G retrofit information
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