Mercedes-Benz presents the new SLK 55 AMG, the most powerful SLK roadster of all time. It comes with a brand new 5.5 litre V8 engine, sporting an impressive 422 horsepower. Other stunning features include the 7 Speedshift transmisson and the performance breaking system, all next to great looks of the car of course. The sports version of the SLK sprints from 0-100 km/h in just 4.6 seconds. The SLK 55 AMG comes to retailers January 2012.