The M3 and M4 also get a new electronically controlled limited slip differential, which can be fully unlocked to improve agility when it's not needed to maximise traction. (evo.co.uk)
To help control the car's increased performance, it's equipped with an electronically controlled limited slip differential as standard. (evo.co.uk)
The R also has a more aggressive electrically controlled limited slip differential, which is claimed to be able to go from fully open to fully locked in just 0.2 - second. (evo.co.uk)