The Porsche 989 a four door performance oriented touring sedan that maintained the iconic shape of the 911 Carrera, but unlike the Panamera, never saw production after it was developed by Porsche between 1988 and 1991. After Ulrich Bez left Porsche in September 1991, the project lost momentum. The severe slump in 928 sales made executives re-think the project. The Porsche Panamera is considered to be the spiritual successor to the 989 project.