With a rich, track-bred legacy, Audi is just as familiar with the track as it is opulent showrooms. Most enthusiasts, however, know the luxury brand more for its street-legal models such as the Audi A4, Audi A5, Audi A6, Audi A7, Audi A8, Audi Q5, and Audi Q7. That said; the popular Four-Ringed automaker has not let common perceptions curtail their sprinting spirit. While they have to keep horsepower across the new Audi lineup within reason; they're cutting loose on the track. So much so that they've just taken an overall victory at the internationally-revered Nurburgring 24-Hour Race…