Audi A4 - car; photo wallpapers: The Audi A4 is an automobile series made by Volkswagen Group, first sold in 1995 as a 1996 model and replacing the Audi 80. It was originally based on the B5, the same as the current VW Passat, and had the same chassis until a redesign in 2002. One distinction was the combination of longitudinal engine orientation and front wheel drive. Four wheel drive was available as an option. It was available with a large range of four and six cylinders from 1.6 L to 2.8 L, with the most popular versions powered by the VW Group's 1.9 TDI engine. In 1998, the sedan/Avant received a facelift with a revised engine—the 2.8 was changed from 2 valves per cylinder to 5 valves per cylinder and power was increased to 193 PS (190 hp/142 kW). Also, new taillights, headlights, and minor interior changes were available the next year. A high-performance version, the Audi S4, was introduced in 2000. The S4 was equipped with a bi-turbo intercooled 2.7 L V6 producing 250 PS (247 hp/184 kW) and 350 Nm (258 ft.lbf) of torque. The car came in both a 6-speed manual and a 5-speed Tiptronic transmission to drive the power to the wheels via Audi's Quattro four wheel drive system. For 2001, the turbo boost on the 1.8T engine was raised to make 170 PS (168 hp/125 kW). Cars with the boosted four get a red shadow under the letter "T" on the back.