Test Drive: 2013 Audi S6 quattro sedan

?Audi?s all-new 2013 S6 sedan delivers exhilarating performance? Westlake Village, CA- As with most auto manufacturers, there exists a model hierarchy within the Audi portfolio. ?A? prefix vehicles represent practicality, function and luxury; ?S? vehicles serve up higher levels of performance than those in the ?A? stable; ?R? designated vehicles are high end performers; and…

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