What you see here is the official new Porsche Panamera, the first four-door sports car by Porsche. This car will rival the Mercedes-Benz CLS, the Audi A7, the BMW CS concept and the Aston Martin Rapide. However, the main feature of the Porsche Panamera is not its four doors, but its powerplant, with engines ranging from 300hp up to over 600hp on the high-end Turbo S version. These four-door speed demons will be available starting in 2009.