My client recently engaged me to appraise his 2003 Audi RS 6 four-door sedan, which was special ordered by his father. This fully-loaded, limited production high-performance sedan was virtually hand-built by Quattro GmbH, the performance division of Audi. It featured a 4.2 liter, 450 horsepower twin turbocharged and intercooled double overhead camshaft aluminum V8 engine with a Bosch Motronic engine control system and port fuel injection, a ZF Tiptronic five speed automatic overdrive transmission, and four-wheel drive. Of the approximately 800 examples of this Audi flagship model, my client’s is the only one that was custom-painted “Nogaro Blue” at the factory.