BMW M3, meet your match... and then some. The all-new 2007 Audi RS4 has arrived. This is the latest RS-badged machine, little brother to the almighty RS6 and the successor to the devastatingly quick RS4 Avant of 2001. Built from the ground-up as the ultimate compact luxury sedan, the RS4 returns for yet another generation with the confidence inspiring grip of all-wheel drive, nothing new for Audi of course.