Roadfly’s Ross Rapoport recently got behind the wheel of the 2012 Mercedes-Benz CLS 63 AMG for a road test. Powering this four-door Coupe is AMG’s glorious 5.5-litre V8 biturbo engine, which develops 391 kW/525 hp and 700 Nm of torque in standard form, or 415 kW/557 hp and 800 Nm when specified with the AMG Performance package. 0-100 km/h (62 mph) occurs in 4.4 and 4.3 seconds respectively, while the top speed is limited to 250 km/h (155 mph).