The A8 is Audi’s large flagship model that’s offered with a variety of drivetrain choices, including a supercharged V-6, a twin-turbo V-8, W-12, or a TDI option. Those who are seeking performance will want to check out the S8, which uses a 520hp twin-turbo V-8. The A8 competes with the Jaguar XJ, Lexus LS, BMW 7-Series, and the...
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