2003-2005 Audi S4 Quattro (B6)

The third-generation Audi S4 Quattro, debuting in Europe in March 2003 and later in North America, marks a significant evolution in Audi's performance lineup, transitioning to the Volkswagen Group B6 (PL46) platform alongside the contemporary Audi B6 A4. This iteration introduced for the first time three bodystyles: the four-door saloon, five-door Avant (estate/wagon), and a two-door Cabriolet, expanding the S4's appeal with versatile options for enthusiasts. Central to its acclaim is the introduction of a 4.2-litre V8 engine, a departure from previous models that heralded a new era of power for the S4 series.

The S4's performance credentials are impressive, with the saloon variant capable of accelerating from 0 to 100 km/h (62.1 mph) in just 5.6 seconds, the Avant in 5.8 seconds, and the Cabriolet in 5.9 seconds. Despite its power, the vehicle's fuel efficiency faces criticism, particularly for the manual transmission model which incurred a gas guzzler tax in the United States due to its combined fuel economy of 20.2 miles per gallon. The S4's top speed is electronically capped at 250 km/h (155.3 mph), reinforcing its position as a high-performance yet practical vehicle within the luxury segment. With production spanning from March 2003 to December 2005, the Audi S4 Quattro remains a landmark in the marque's history, embodying a blend of dynamic driving, advanced engineering, and versatile design.