Audi A6 has four doors, but it doesn't look like a sedan. Its stylish flair and sweeping lines evoke the sportiness of a coupe. Now in its fourth model year after a smart redesign in 1998, this luxury entry possesses clean lines that are still fresh and forward-looking, with new, fussed-over features and modifications for 2001. A6 2.7T sedan comes with a 250-horsepower twin-turbo V6, a Torsen center differential, P215/55R16 tires, traction control, and an electronic stability program., , ,