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The wind tunnel model for the Piper sportscar (Piper have been working with the FIA on the new regs) was at the Autosport show. There were definatly sizable tunnels on the car. The tunnels were quite a similar size to those on a Group-C car. They begin as two raised sections ~2mm deep and 30mm wide (on the model) which start at the front of the floor, behind the nose diffuser..
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