Under the hood of the 2007 Audi S6 is a ten-cylinder engine that provides 420 horsepower, just 30 fewer ponies than found in the larger S8 sedan. That V10 propels Audi’s midsize sedan to 60 mph in only 5.1 clicks, while the S6 Avant wagon model requires an additional fraction of a second. In addition to the 420-horsepower V10, there’s a six-speed Tiptronic transmission, updated sports seats that offer multiple power adjustments and are covered in one of two fine leathers, dual-zone climate control, 19-inch alloys rolling on 265/35 tires, and innovative LED daytime running lights; Avant versions also get LED taillights. Other enhancements include special badges, a painted rear diffuser, quad tailpipes, and unique rear spoilers. Carbon fiber is used in the interior, and Audi’s MMI system, complete with a seven-inch monitor, is standard.