A new A8, equipped with a lighter structure, will arrive here next year. In the meantime, the current version remains Audi’s biggest and most expensive sedan. Available in short or long versions, the A8 is offered in various trim levels. The S8’s turbo V8 develops 605 horsepower and 517 lb·ft of torque. It is able to sprint from 0 to 100 km/h in a mere 3.7 seconds—making it as fast as certain supercars.