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The 2013 Quattro Audi S4 and Audi A4 have been refreshed and revitalized with new and more modern sheet metal, revised headlamps and minor tweaks to the car’s interior. But the real fun news is under the hood of the supercharged Audi S4. With 333 horsepower and Quattro all-wheel-drive the Audi S4 is the fastest 4 you can buy today. Of course that will change once Audi brings the killer RS4 to the States but for now the S4 is the fastest game in town. We recently had the chance to d
