Previously, Audi's only performance version of its A6 was the S6. But the 2003 S6 was only offered as an Avant wagon. Practical and fun, yes, but maybe missing a little hip quotient. In 2003, Audi and its quattro GmbH subsidiary offered the Audi RS 6, a beast of a sports performer locked in the classic lines of the high-end A6 body. At the time, it was Audi's fastest car.

The RS 6 was a 4-door sedan, and it had the same 4.2-liter, 40-valve 450-hp V8 engine as the S6, but the 2003 RS 6 featured twin turbos. That meant the RS 6 could hit 0-60 in 4.6 seconds. With a 5-speed Tiptronic transmission and low-end torque action, acceleration was quick. It hit 415 lb-ft of torque across a wide RPM range. The ride is smooth and balanced, the interior so plush you may be unaware you're exceeding the speed limit by double digits.

The limited-edition RS 6 (around 1,000 were sent over here) was available for one year only. It featured a stiffer suspension, lower ride height and stronger shocks. It was also the first Audi to feature the Dynamic Ride Control suspension, designed to reduce body sway and roll during cornering. All-wheel-drive quattro added to its expert handling and road performance. Because it was built on the A6's frame, it was a fairly roomy family sedan, with folding rear seats for more trunk space. Standard features included leather sports-style seats, power adjustable seats and mirrors with memory settings, heated front and rear seats, a power sunroof, ski bag, parking assistance sensors and xenon headlights with washers. The outside was subtly distinguished from the A6 by a rear spoiler, badging on the grille, flared wheel wells, aluminum trim and dual exhausts.

The 2003 RS 6 cooks, and drivers love its overall performance. Acceleration is immediate and responsive, handling tight and confident, and the quattro always outstanding. All of this in a stylish, high-end luxury sedan makes for a perfect combination. Owners are disappointed with the outdated optional navigation system. They wish it came with a manual transmission. Others complain about customer service. Poor fuel economy and overall priciness are other detractions.