Seems like they now have different springs for the M3 and M4:
V1: E10-20-031-09-22 -> 0.8"/0.2"
M3: E10-20-036-01-22 -> 1.0"/0.5"
M4: E10-20-037-01-22 -> 0.8"/0.4"
https://eibach.com/us/c-56-car-truck-suv.html
https://eibach.com/us/c-56-car-truck-suv.html