621-hp twin-turbocharged 4.0-liter V8, paired with an eight-speed Tiptronic transaxle, Quattro all-wheel drive, and a sport rear differential. Factory equipment includes Dynamic Ride Control, rear-axle steering, cross-drilled RS brakes, a panoramic roof, and a factory-optioned sport exhaust. Black leather seats with Mercato Blue stitching, a heated Alcantara steering wheel, and the Blue RS Design Package add the interior-specific details.