For 2007, the V-8 engine in the A8 and A8 L models gain Audi's FSI direct fuel-injection system, which boosts power and fuel economy. Also new is the S8, a 450-hp, V-10-powered performance variant.

Audi's largest car model, known for its lightweight aluminum space-frame construction, is available in both standard (A8) and extended-wheelbase (A8 L) form. For 2007, the A8's standard 4.2-liter V-8 gets Audi’s FSI direct fuel-injection system, which boosts output to 350 hp and increases EPA fuel economy estimates by 1 mpg compared to last year's model. The top-line version of the A8 lineup is the A8 L W12. According to Audi, its 12-cylinder engine, which produces 450 hp and 428 lb.-ft. of torque, propels the A8 to 60 mph in 5 seconds. All engines are backed by a Tiptronic 6-speed automatic with Audi's quattro all-wheel-drive system.