The supercharged V8 engine in the SL 55 AMG mae it the most powerful Mercedes passenger car at its debut. The new 5.5-litre powerplant develops a remarkable 493 hp
 
and generates maximum torque of 516 lb-ft as low as 2650 rpm. This level of torque is available up to 4500 rpm. The end result is awesome performance on tap at low revs and unsurpassed elasticity under acceleration in any gear. The SL 55 AMG covers the sprint from 0 to 60 mph in less than 4.7 seconds and reaches an electronically limited top speed of 155 mph. These imposing engine data power the new SL 55 AMG to the top of the eight-cylinder roadster segment worldwide in terms of performance and torque.

From the outside, the AMG Roadster can be distinguished from the SL500 by several features, including even more dynamic styling, striking side skirts, darkened taillights, sporty 18-inch multi-spoke wheels and four chromed tailpipes.