Why change a winning formula? That is perhaps the reasoning behind Audi's decision to keep its Audi A6 and Audi A7 sedans mostly intact. Mostly. Acknowledging that it still needs to be attractive to buyers tempted to look at competitors' shiny new offerings, Audi has given the A6 and A7 a slightly makeover, both externally and internally, that, especially for the A6 and A6 Avant, give the cars a bolder, sharper visage. Best of all, Audi has kept the best things about the A6 and A7, including the same starting price.