The custom-built RS 6 boasts a murdered-out look.

Audi's Exclusive division has lifted the veil off of a one-off RS 6 Avant.The custom RS 6 stands out thanks to a murdered-out appearance characterized by a flat gray paint job, real carbon fiber trim on both ends as well as on the door mirrors and glossy black five-spoke alloy wheels wrapped by low-profile tires.

The treatment continues inside with carbon fiber trim on the center console and on the door panels and black leather upholstery with yellow contrast stitching.

Audi has not made any mechanical modifications to the RS 6, meaning the one-off model packs a twin-turbocharged 4.0-liter V8 engine that develops 552 horsepower and 516 lb-ft. of torque. It spins all four wheels via an eight-speed tiptronic transmission controlled by shift paddles and Audi's quattro all-wheel drive system. The sprint from zero to 62 mph takes 3.9 seconds, and top speed is electronically limited to 189 mph.

Ventilated discs and six-piston calipers bring the super wagon to a stop. Audi has not revealed if the one-off model is fitted with the standard steel suspension or the optional adjustable air suspension.

Similarly, Audi Exclusive has not disclosed how much the one-off RS 6 Avant costs. The stock RS 6 carries a base price of €109,200 in Germany, a lofty sum that converts to nearly $133,000.