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Is the differential hardware of a plain M3/M4 from 2015 the same as a GTS, and the GTS differential improvements come only from software? If they are different, is there any downside going with the GTS differential tuning on a non-GTS?
The GTS press release from BMW has the following info on the differential, but it's hard to tell if only the tuning has changed or the hardware as well.
"Further enhanced rear-wheel drive with Active M Differential.
Other features helping to add an extra edge to the driving dynamics include the rear differential’s hollow lightweight output shafts and the Active M Differential. To optimize traction and stability, the latter uses an electronically controlled multi-plate limited-slip differential, which is adapted to the significantly enhanced performance capability of the BMW M4 GTS. The multi-plate limited-slip differential is proactively controlled with extremely high precision and speed. Its control unit is linked to the Dynamic Stability Control (DSC) system and takes into account accelerator pedal position, wheel speeds and vehicle yaw. All driving situations can therefore be precisely analyzed and an imminent loss of traction at one side of the vehicle is identified at a very early stage. When necessary, the system reacts with split-second speed to vary the locking action, which can be anywhere between zero and 100 percent. This prevents wheel spin on low-traction surfaces, on split-traction surfaces with a big difference in friction coefficient between the left and right rear wheels, on tight hairpin bends or during fast steering maneuvers. The optimized traction also provides superb stability in challenging conditions and allows to optimally transfer the power to the ground while accelerating out of corners."
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