The Audi S5 is sweet sports coupe, with a 4.2L V-8 pumping out 349 horsepower that goes through Audi's famous Quattro all-wheel-drive system. Plus it's one of the most handsome Audis in recent memory. But now, according to Audi, the sweet is going to get sweeter in the RS5. The Audi has put the R8 V-8, with the extra 100 horspower. The under...read full article