The S4 is the sports sedan variant of Audi's compact executive car. The first generation S4, built from 1991 until 1994, was a performance-oriented version of Audi's 100 sedan, while since 1997 the S4 has served as the performance variant of the A4 lineup; as the A4 has evolved from one generation to the next, so has the S4. A more powerful engine, larger brakes, more aggressively tuned suspension components and larger wheels have always been amongst the many upgrades the S4 receives over it's "lesser sibling".
Like their non-sporting counterparts, all S4 variants have had longitudinally oriented, front-mounted engines. A single turbocharged. 2.2 liter inline five-cylinder powered the original C4 version, a 2.7 liter twin-turbocharged V6 powered the B5 generation, B6 and B7 versions shared a common 4.2 liter V8 and the recently introduced B8 generation uses a supercharged 3.0 liter V6.
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