This 34k-mile 2003 Audi RS6 features a twin-turbocharged 4.2-liter V8, Quattro all-wheel drive, and an adaptive sport suspension. Notable features include eight-piston front brake calipers, carbon-fiber interior trim, heated front and rear seats, and an optional sound-enhancing exhaust system. Recent service included replacing valve cover gaskets, brake pads and rotors, and the right-front axle, though the Alcantara headliner is sagging above the rear seats.