In 2004 Audi released the RS6 Base to the car-buying market. The RS6 came in one configurations: Base. The Base configuration is powered by the 4.2-liter eight-cylinder engine, which makes 30 highway miles and 23 city. The RS6 competes in the Sedan market segment, in direct competition with Kia.

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The 2003 RS6 is an important vehicle to Audi for the sedan market segment. The Base is a member of a series of one trim levels for the RS6 which include Base. The four-door car with its all-wheel drive is positioned to aggressively fill this niche for Audi. There is strong competition from vehicles from Lexus.

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One of the staples of the Sedan segment is the Audi S4. In the previous model year debuted a brand new version of the S4 with one versions: Base. Sales for the S4, especially the S4 Base, were brisk during 1994 and 1995. The improved vehicle quality and the modern styling were responsible for the boost in sales.

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In 2007 Audi released the S4 Avant to the car-buying market. The S4 came in three configurations: Base, Avant, and Cabriolet. The Avant configuration is powered by the 4.2-liter eight-cylinder engine, which makes 32 highway miles and 23 city. The S4 competes in the Wagon market segment, in direct competition with Kia.

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