Aston Martin DBS Volante versus Mercedes-Benz SLS AMG Roadster; 510bhp Aston takes on 563bhp Merc in the battle of the convertible supercars. Tiff Needell finds out which is faster - and which is more enjoyable - at a rather damp Bedford Autodrome in the video below. For the full feature, and a detailed breakdown of the cars' laps (plus evo's full performance car leaderboard), grab your copy of evo's August 2012 issue - full details here.
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