Affalterbach, Aug 21, 2011 - The Mercedes-Benz SLK 55 AMG is the most powerful SLK of all time. Its newly developed AMG 5.5-litre V8 engine featuring cylinder shut-off combines the ultimate in performance with the lowest possible fuel consumption. With a peak output of 310 kW (422 hp) and maximum torque of 540 Nm, the SLK 55 AMG outperforms all of its direct competitors.