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The Audi S4, whose production first started in the year 1991, is a high performance variant to the Audi A4 compact executive car model. Originally produced only till 1994, the S4 was a performance-oriented version of the manufacturer's 100 saloon/sedan. All S4 models produced since 1997 have been modeled on the A4 with both models having undergone significant evolution one generation after another. A more powerful internal combustion engine, larger upgraded brakes, firmer suspension, larger roadwheels, and distinctive sheetmetal, styling clues and badging have always been amongst the many upgrades the S4 receives over its mainstream 100 and A4 siblings.