Unfortunately, we can't get too excited as the Audi Sport Quattro Concept has been made only to celebrate the 30th birthday of its legendary namesake. But of course, it still boasts specs worth drooling over such as the 4-liter TFSI V8 engine with 700-hp that will deliver a top speed of 189 mph, the first 60 in a heart-stopping 3.7 seconds.