Porsche Mission R lives on as electric Porsche 718 Cayman GT4 ePerformance News Prototypes May 17, 2022 Arif Chan Serving as a test vehicle, the Porsche 718 Cayman GT4 ePerformance combines the powertrain from the Porsche Mission R concept study with the chassis of the Porsche 718 Cayman GT4 Clubsport. Said to be on par with the current 992-generation 911 ...