Atlanta. Porsche today announced a Manthey Kit for the 718 Cayman GT4 RS that is specially optimized for use on race tracks. The 493 hp GT4 RS with the Manthey Kit completed a lap at the Nürburgring Nordschleife in 7:03.121 minutes. This makes it over six seconds quicker than the 718 Cayman GT4 RS without the […]