Sitting an inch lower than a stock A4, the 2006 Audi RS4 looks serious even at first glance. With 418 horsepower and 317 lb.-ft. of torque, it clearly is serious. The Audi RS4 can scream from 0-60 mph in a mere 4.5 seconds, and Audi also claims a 0-to-124 mph speed of 16.6 seconds. That’s fast. Contributing to those numbers is the use of lightweight aluminum for the hood, front fenders and suspension pieces, and the installation of ultra-light sport seats.