The Audi RS6 Sedan is a variant of the C5 Audi RS6. Introduced for the 2003 model year, the RS6 was an all wheel drive performance sedan that was powered by a twin-turbocharged 4.2L V8 engine. This powerplant developed 444hp, which it sent to the wheels through a 5 speed automatic transmission. Production of the C5 RS6 sedan lasted until 2004, but the RS6 model series would continue life in the next generation A6 as the C6 Audi RS6.