Audi A4 sedan, A5 convertible, A6 sedan and station wagon, A6 allroad quattro and top model Audi A8 are all produced in Neckasum factory. Quattro, a wholly-owned subsidiary of Audi, is responsible for building Audi R8, R8 Spyder and RS 6. The technology research and development here is mainly devoted to light body design, engine research and development and interior design research and development.