The smallest roadster in the automaker's lineup is all-new for 2012, and hardly in need of more power, but that hasn't stopped Mercedes-Benz from shoehorning its AMG-tuned 5.5-liter V8 under the hood. The naturally-aspirated M152 engine, featuring direct injection, is rated at 415 horsepower at 6,800 rpm with 398 pound-feet of torque at 4,500 rpm. The standard gearbox is AMG's Speedshift Plus 7G-Tronic automatic with three electronic modes. Rev-matching on downshifts is also standard. According
Mercedes-Benz has unveiled the latest addition to the SLK Roadster lineup, the 2012 SLK55 AMG. For this iteration of the diminutive droptop, AMG is employing a naturally-aspirated version of Mercedes-Benz's 5.5-liter V8.
Balancing power and economy is a tricky business, especially for Mercedes-Benz and its in-house performance division, AMG. On the one hand, a buyer's conscience demands improved fuel economy and reduced emissions. But on the other, AMG knows what its customers really want is pure, unadulterated muscle.