Audi intends to unleash a serious powerhouse in the summer of 2003 in the form of a limited-edition RS6 sedan. At a glance, the RS6 might look like an ordinary four-door sedan. But underneath the hood lurks a bi-turbo 4.2-liter V-8 engine that cranks out a whopping 450 horsepower at 6,500 rpm. That kind of power translates to a 0-to-60-mph acceleration time of 4.6 seconds.Side-by-Side Comparison
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