Audi stunned the world with the Le Mans Quattro concept car that appeared at the 2003 Frankfurt Motor Show. It was built to celebrate the brand’s trio of wins at the 24 hours of Le Mans between 2000 and 2002. The concept later served as the basis for the production R8, and it’s rumored to have a value of $5 million, which could make it the most valuable Audi ever.Another concept, the Avus quattro of 1991, has an aluminum space frame that previewed the mass-produced A8 sedan that…
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Source: https://carbuzz.com/features/most-expensive-audi-models-you-can-buy-in-america