So-- after reading this thread and going "Hmmmmm", I talked to the guys at Bimmerworld about suspension upgrades for (mostly) street.
We discussed the M Performance, but they recommended the MCS 1-way damper set w/ appropriate springs instead, saying that would give a far better "daily driver" ride than the M Performance.
Thoughts?
https://www.bimmerworld.com/MCS-F8X-...et-non-CO.html