The latest version of Merc's hardcore convertible gets reviewed for the first time. The 2013 version of the Mercedes SL63 AMG has a completely new 5.5-liter biturbo engine, which replaces the previous 6.2-liter V8. The SL63 name is kept for heritage purposes only. The new SL63 AMG (2013) has an output of 537 hp and 800 Nm of torque. With a top speed of 155 mph (250 km/h) and a 0-62 mph (0-100 km/h) sprint of just 4.2 seconds, the new Mercedes SL63 AMG (2013) is one of the fastest roadsters you’ll be able to take for a test drive at the moment.