The Porsche 996 is the internal designation for the Porsche 911 model manufactured and sold between 1998 and 2005. It was replaced by the Type 997. Both body styles were produced by Porsche in 2005, based upon model type.
At its debut, the 996 featured the most significant changes to the Carrera model since its 1963 introduction; the most significant change with this new iteration is the water-cooled engine replacing the previously air-cooled engine. Progressively stringent noise regulations, environmental concerns, a higher expectation for refinement and a high-performance 4 valve per cylinder engine made the switch necessary. Other changes include a sleeker body with a more steeply raked windshield and a re-designed interior.