The exotic Mercedes-Benz SLS AMG is replaced for 2013 by the SLS AMG GT, a more sporting evolution that adds 20 horses to the atmospheric 6.2 litre V8, for a total of 583.. The Roadster version that bowed during the 2012 model year keeps the spectacular looks of the “gullwing” coupe, despite its regular doors. The soft top goes down in a scant 11 seconds. For nice fall top-down drives, the “Airscarf ” system blows heated air in the neck area.