For 2003, one-half of Saab's two-vehicle product range has undergone a metamorphosis. The first Saab product created in full cooperation with General Motors, the 2003 9-3 is based on the GM Epsilon platform. Ordered as Arc, Linear and Vector trim level, the turbocharged engines produce between 175 and 210 horsepower depending on the model. A body styling departure from previous entry-level Saab models, the hatchback roof line has been replaced on the new 9-3. The new Saab 9-3 architecture appears only as a four-door sedan. The 2003 9-3 convertible remains based on the previous generation model. For 2003, the Saab 9-5 equipped with a five-speed automatic transmission can now be manually shifted by the driver via steering wheel mounted buttons.