and is it an "integrated" solution (uses steering wheel buttons and Nav screen to display info)? When I inquired a few years back I was told there is no official BMW Sirius module for our vehicles so I abandoned the search.

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2005 X5 4.4 (Sterling on Truffle) w/sport everything
2011 Audi S4 (Prestige, DSG)
2012 Audi Q7 (Sport, S-Line)