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The 2013 Audi S8 retains it’s position as the flagship S-car in the model lineup and gets the flagship high-output version of the 4.0 TFSI twin-turbo V8 rated at 520-horsepower and 479 lb-ft of torque between 1,700 rpm and 5,500 rpm. Audi says that the power combined with a relatively light for...