The Porsche 911 is a luxury 2-door sports coupe made by Porsche AG of Stuttgart, Germany. It has a distinctive design, rear-engined and with independent rear suspension, an evolution of the swing axle on the Porsche 356. The engine was also air-cooled until the introduction of the Type 996 in 1998. Since its introduction on September 11, 1963, it has undergone continuous development, though the basic concept has remained little changed. It is built in Stuttgart,Germany. It has been in production since 1963 to today.