Jaguar makes its super coupe available as a super convertible, albeit in very small quantities. With its 550-hp supercharged V-8, snarling exhaust note, and no-ordinary-housecat body mods, the 2012 Jaguar XKR-S coupe is a serious performance machine. But for every coupe fan, there is another person—often the coupe fan’s spouse—that would prefer a droptop. Allow [...]