The Porsche 911 is one of the most iconic sports cars in history, with a design that has remained largely unchanged since its inception in 1963. Over the years, the car has undergone several changes and improvements, including the transition from air-cooled engines to water-cooled engines. This article will delve into the history of the water-cooled Porsche 911 generations, including the 996, 997, 991 and 992.