The Audi S4 is the higher-performance version of Audi's entry-level luxury sedan--at least until a new A3 sedan and its inevitable S3 upgrade arrive in the U.S., sometime in 2015. It competes with the likes of the Infiniti Q50, Mercedes-Benz C63 AMG, and the BMW M3. The Audi S4 has, at times, throughout its long history, been accompanied by a...
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