The current CLK is four years old, so it is no surprise that the highlight here is the new, AMG-developed 6.2-liter V-8 beast that is spreading throughout Mercedes’ lineup of cranked-up AMG cars. It puts out 475 horsepower in the CLK63, making last year’s 362-hp CLK55 AMG seem a little tame. The new engine comes alive right off idle, heaving the tach toward the 7200-rpm redline and singing a refined yet seductive engine snarl that is nothing short of amazing.