The Audi S4 Avant is a high-performance version of Audi's A4 Avant station wagon. It was introduced in 2000, and has since undergone several generations of releases. It features a powerful turbocharged engine and a range of sporty refinements, including suspension and styling upgrades. The S4 Avant is often compared with the Audi S4, which is the performance version of the Audi A4 sedan.