GM Concept Cadillac CIEN (for one hundred in Spanish) is a project of supercar that appeared at Detroit Auto Show in 2002 in order to enhance the image of Cadillac brand. The project is a mid engined two seater supercar propelled by a V12. The shape of the body is striking, modern design with characteristic feature lines running the length of the body in a way that is typically Cadillac. Doors swing forward and air intakes and outlet are electronically controlled. There is a rear spoiler that adjust its angle with the speed of the car. Wheel s are 19 inches front and 21 inches rear.