I could have saved you all that trouble...
In the marketing literature for the MZ4 Roadster and coupe, it was mentioned that the viscous coupling in the LSD in the coupe has been redesigned and retuned to provide a rudimentary, beta version of torque vectoring. In any given turn, when both rear wheels are on the ground in full contact and traction, the ///M variable diff is tuned to send MORE POWER to the outside wheel.
An upgrade would be for someone with and E46 M3 to swap to the MZ4 Coupe's diff, not the other way around. The internals of the MZ4's LSD has some basic torque vectoring functions built in.
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Sitting on a beat-up office chair in front of a 5 year old computer in a basement floor, sipping on stale coffee watching a bunch of meaningless numbers scrolling aimlessly on a dimly lit 19” monitor.
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