The purple ragtop is the first time a high-performance M4 test vehicle has been seen in public, with the same camouflage as other 4 Series prototypes.
The rear of the M4 looks similar to the current M4, with quad exhaust outlets, vertical reflectors, and new taillights.
BMW is testing a 2025 M4 with a 525 hp twin-turbocharged I6 engine, which could mean small power increases for other trims. An official debut could happen late this year or early in 2024.
Source: motor1.com
