The SLK 55 AMG is a performance version of the SLK with AMG's naturally aspirated 5.4L M113 V8 producing 360 PS (265 kW; 355 hp) at 5750 rpm and 510 N⋅m (376 lbf⋅ft) of torque at 4000 rpm, and only offered with a 7-speed automatic transmission. Mercedes quotes a 0-62 mph (100 km/h) time of 4.9 seconds, and Car and Driver reported a 0-60 mph time of 4.3 seconds as well as a quarter mile time of 12.7 seconds.