AMG Market News: The 2012 SLK55 AMG has a naturally-aspirated version of Mercedes-Benz’s 5.5-liter V8 – dubbed the M152 engine. Therefore, no twin-turbos found in several AMGs with the M157.

2012 Mercedes-Benz SLK55 AMGThe new aluminum engine reports 415 horsepower and 398 pound-feet of torque as well as direct injection with a stop-start feature to help improve fuel mileage. Look for the Mercedes-Benz roadster to arrive in showrooms sometime in January 2012; MSRP: $54,800.