This 2003 Audi RS6, showing 128k miles, features a twin-turbocharged 4.2-liter V8 with an optional sound-enhancing exhaust and a believed aftermarket performance ECU chip. Equipped with heated front and rear seats, Bose audio, carbon fiber trim, navigation, and a K40 integrated radar detector, it has a clean California title and Carfax report. Imperfections are noted on the front bumper cover and wheels, and a transmission leak was recently repaired.