Porsche GT4 Clubsport and Clubsport MR: Two Race Cars Derived from the Porsche Cayman Coupe Published on September 28, 2016 in First Drives by Gabriel Gélinas Photo: Porsche Motorsport Porsche GT4 Clubsport MR - The suspension was set for the Nürburgring circuit, which explains in part why the MR was faster on the bumpy road circuit of the Lausitzring EuroSpeedway.