The Mercedes CLK 63 AMG Cabriolet is like a woman with large, perfectly shaped breasts. No matter how much you try to talk about her other qualities, your attention keeps returning to one thing: the engine's enormous peak output. The CLK holsters AMG's first purpose-built powerplant, a normally aspirated mill good for 475 horsepower (507 in its less restricted sibilings). As usual, it's assembled in Affalterbach by one satanic mechanic, whose name is stamped on a plate affixed to the engine block. In another nod to heritage, the "63" represents the engine's displacement rounded up from 6.2-liters; homage to the legendary 300 SEL 6.3 produced by Mercedes-Benz from 1968-1972. That's some heavy heritage.