The 2010 Audi S6 shares much of its body and interior with the Audi A6 lineup, and the performance S6 edition carries on the sedan's classic roofline arc and "tornado" line that trails along the lower sills, but it sits lower and has side skirts and air dams that amp up the graceful shape. The S6 adds shiny carbon-fiber trim to the cabin, and it's...
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