Automakers need halo cars. They bring people into the showroom and demonstrate just what their engineers can do. Typically those range-topping vehicles come in the form of sports cars – think Audi R8, Dodge Viper, Lexus LFA et al – but Mercedes-Benz is reportedly taking another direction. That’s because these exotic supercars tend to sell in small numbers (almost by definition), while – for Mercedes-Benz – mid-size luxury sedans like the E-Class sell in much bigger numbers. As such, the Silver Star automaker is planning on making its next halo car a four-door sedan (of sorts). Funk Flex