The Porsche 964 is the fourth generation of the Porsche 911. It was produced from 1989 to 1994, and is considered to be one of the most iconic 911 generations. The 964 was the first 911 to be powered by a water-cooled engine, and it also featured a number of other changes, including a new body style, a revised suspension, and a more luxurious interior. The 964 was available in a variety of models, including the Carrera, Carrera 4, Carrera RS, and Turbo.