This spring towards the end of a series of articles on Citroën and Adolphe Kegresse, I mentioned his invention of the dual clutch transmission and its widespread use by the VW group and Porsche. Despite my cracking jokes about the farting exhaust noises they make when shifting, DCT or PDK (as Porsche call their version) is no laughing matter. Apart from the fuel efficiency advantages offered by the elimination of a torque converter, thereby avoiding the energy loss inherent i