For this latest Epic Drives auto adventure, Arthur St. Antoine straps into the fastest Jaguar sedan ever built, the vicious new 550-hp 2013 XFR-S, for a unforgettable sweep across the deep South—including high-adrenaline encounters with wild alligators, drag racing's greatest-ever star Don Garlits, New Orleans' anything-goes French Quarter, and the outrageous Circuit of the Americas Formula 1 racetrack in Austin, Texas.