Dude,
That's a big job to tackle, a lot of parts. If you are talking about the nav as in the new A6, it uses MMI. not sure if you really want to deal with all that is involved there, I know I wouldn't. (and I've done a lot of interior mods to other cars).
But if you're up to it, the only parts I know of are in the trunk of the A6, driver side access panel, DVD reader, computer, etc is all attached to one another. I believe thats it, again except for all the MMI stuff.
Good luck, keep us posted if you go for it!
-Mike
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