A refreshed BMW 4 Series is in development, as we've seen in a plethora of spy photos. But the purple ragtop featured here is actually the first time we caught a high-performance M4 test vehicle ...

Related: 2021 BMW M440i Convertible Review: Escape Artist Both the regular 4 Series and the performance-minded M4 soon will house BMW’s curved display, which features a 12.3-inch information ...