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You may be able to enable it via coding...looks like SA 2VG.
I wouldn't sweat it, from what I read, the yaw control aspect, etc. (in addition to being annoying/instrusive when hustling the car) is phased out as speeds rise. Not sure about the torque split...but 40/60 is plenty decent enough. You'll only (perhaps) miss even more rear bias autoxing or tracking, really.
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'02 S54 M3 (500/500 GC/Koni)
'08 N54 135 (JB4, DCI, BMW PS/Bilstein B6s, H&R M3 FSB, Strongflex FCABs)
'14 N55 X1 (JB4, BMS DP, BMS Intake, Alpina TCU reflash, H&R Sports, Bilstein B6s, E93 M3 RSB, Strongflex FCABs, baby seat)
'08 N54 535xi touring (Bilstein B6s, Downpipes, MHD tune, baby seat)
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