The SL55 AMG version was released in 2002 with a supercharged 5.4 L (5439 cc) Mercedes-AMG V8. This car produced 493 hp (367 kW) at 6,100 rpm and could run to 100 km/h (62 mph) in 4.7 seconds.The SL55 AMG was updated for 2007 with a 510 hp (380 kW)/531 ft·lbf (720 N·m) version of the same engine. The new model has only slight visual differentiators, the most noticeable is the three-slat grille rather than the four-slat version used previously. It should be 0.2 seconds quicker to 100 km/h. Although the top speed remains limited to 250 km/h (155 mph), Mercedes-Benz will now allow the governor to be eliminated, increasing maximum speed to 300 km/h (186 mph).
