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Audi’s new RS 3 Sportback, the ultimate A3, has been revealed as the most powerful compact car in production, managing to edge out Mercedes-Benz’s A45 AMG and CLA45 AMG by a nose. The new RS 3, which is yet to be confirmed for the U.S. market, packs Audi’s familiar turbocharged 2.5-liter five-cylinder engine which rates in at 362 horsepower and 343 pound-feet of torque.