S6 - It is powered by a 5.2-litre Fuel Stratified Injection (FSI) V10 engine and reaches 100 km/h in 5.2 seconds.
RS6 - The most powerful vehicle ever produced by Audi with a power output of 426 kilowatts (579 PS; 571 bhp).
In 2008 facelift was performed. Most of lights were redesigned as many lamps were changed for LED ones. Selection of engines was also upgraded.
Also called Typ 4F. Longer than its predecessor and equipped with the new Audi trademark "single-frame grille". Some modern technology was used as: Multi Media Interface (MMI), which is a system controlling in-car entertainment, satellite navigation, climate control, car settings such as suspension configuration and optional electronic accessories through a central screen interface. This model won the World Car of the Year award in 2005.