OP
I have an M135i here in the UK with jb4'd 400/470 power and torque. I have birds B1s suspension including QLSD - excellent IMHO.
E-diff etc can be coded off see
this 2addicts thread.
I've not done this yet as I find QLSD makes most of OEM system redundant in terms of them interfering during trackdays etc.
BP