BMW CS Concept in Shanghai

The 4-door coupe craze, initiated by Mercedes-Benz and their lovely CLS, is in full expansion. Over the last few years, other car companies, especially high-end ones, have been introducing concepts one after the other. The long rumoured 4-door Porsche Panamera was first and then, Aston Martin unveiled their 4-door Rapide Concept last year. And now, here comes BMW.