The Audi S4 is the automaker's original compact sports sedan, priced above the Audi S3 sedan and below the Audi S6, S7, and S8 sedans in the automaker's S series of sporty four-door models.
A powerful 252-horsepower engine combined with Audi's excellent quattro all-wheel-drive system, and the A4 gives BMW's 3-Series and Mercedes' C-Class a serious run for the money, while its sporty ...
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