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: 2025 BMW M4: New Tech, More Power, $80,095 Starting Price Both the turbocharged 2.0-liter four-cylinder engine in the 430i and the M440i’s turbocharged inline-six benefit from a new 48 ...