Porsche runs Cayman GT4 Clubsport as course car Fans are in for a real treat at the ADAC Rallye Deutschland contested from 16-19 August: A very special course car, the Porsche Cayman GT4 Clubsport, will run ahead of the starter field. For Porsche, the entry of a concept study for the FIA R-GT category based on the near-production GT circuit race car is a critical test under real conditions. Whether this turns into a rally project for customers…