Porsche GT4 RS and 992 GT3 screenshot from 888MF YouTubeReggie Sison·Porsche 911Porsche VideoPorsche 911 (992)Porsche Cayman GT4 RS992 GT3VIDEO: Porsche GT4 RS Vs. 992 GT3 Join Mark as he takes the Porsche GT4 RS and the 992 GT3 for a spin around the Italian Mountains to see which of the awesome cars would come out on top.