Any car tasked with taking on the BMW 3 Series has a tough road ahead of it – both in the showroom and, literally, on the road. Such is the fate the Audi A5 has faced since hitting the scene in 2008, going up against one of the most cheered and revered coupes on the market. To take on BMW's two-door titan (as well as a growing number of luxury coupes), Audi has spent every year since the A5's debut tweaking and changing it, giving the range a lineup of trims and models that has been simplified almost to perfection: Those who desire a great-looking luxury coupe with solid fuel economy can have the A5, while those who want more power can spend more money for the S5, and then, of course, there's the monstrous new-to-the-US RS5