Tiff Needell clearly has one of the best assignments in the world. His task: test drive both the Aston Martin
DBS Volante and the Mercedes SLS AMG Roadster on the track in order to determine which is number one. But first, a few specs about each car to give you some better background. The DBS Volante is powered by a 6.0-liter V12 with 510hp. The SLS AMG Roadster, by comparison, has a 6.3-liter V8 that produces 563hp - and a total of 10 percent more torque.