Aston Martin's four-door sports coupe, the Rapide, is set to go into production by summer '07. The Rapide, originally unveiled as a concept vehicle at the 2006 Detroit Auto Show, will have a two to three year head start on its only competitor, the Porsche Panamera. Porsche's 4-door sports coupe is not expected to hit dealer lots before the 2009 or 2010 model year. Aston Martin expects to produce between 3,000 & 3,500 Rapides a year; Porsche plans to move about 20,000 Panameras per model year.