Mercedes-Benz C55 AMG
The C55 AMG was powered by a new 5.4L V8. This was an evolution of the V8 engine found in the previous E-Class, with power raised to 362 hp at 5750 rpm and torque climbing to 510 N·m at 4000 rpm. The C55 AMG uses a V8 from the same engine family as the W202-generation C 43 AMG. Though maximum speed is still limited to 250 km/h (155 mph), the 0 to 100 km/h (62 mph) time has dropped to 4.9 seconds, and the C55 AMG is considered the sportiest AMG model in the C-Class history before the recent release of the W204 (third generation) C 63 AMG. Unlike the less-powerful V6s in the rest of the Mercedes-Benz lineup, the C55 AMG continued to use the five-speed automatic with AMG Speedshift.
Source: Wikipedia, 2012