In addition to climate control systems and leather seats, the S6 buyer also gets rain-sensing wipers, Audi’s MMI central-control interface, a 13-speaker Bose sound system with a six-disc CD changer and MP3 player, heated windshield and headlight washers, Bluetooth connectivity, and the safety of front-side as well as side-curtain airbags for front and rear passengers. Of course, the usual array of luxury features such as power windows and mirrors are covered, too.