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 presented back in 1988.
The idea of creating the 989 came as a result of strong 928 sales. Porsche engineer Dr. Ulrich Bez decided to design a four door sporty touring vehicle that could compete with models from Mercedes-Benz and BMW. As a result the Porsche 989 featured a new front-engine, rear-drive platform with a wheelbase of 2826 mm (111.3 in) and was powered by an 80 degree, water cooled V8 engine with a power output of around 300 HP and displaced somewhere between 3.6 and 4.2 Liters.
In 1991 Ulrich Bez left Porsche. Besides that the 928 sales dropped considerably, so Porsche had to rethink the decision of building a four-door sedan model. Porsche said they have destroyed the only prototype ever built and dropped the idea.
However, latest reports suggest the 989 prototype still exist.