I have a 2013 M3W and the only formal recall has been for a redesigned bolt in chassis brace replacing the original bolted in horizontal brace with one which is both horizontal and triangulated back to the main chassis member just behind the front of the body work.
Other factory recommended FOC mods done at the services have been improved earth bonding of the rectifier and spacer washers under the cam belt cover for improved cooling of the cam belt.
Other modifications which had to be paid for are:
Comfort kit which raised the steering arms to horizontal to decrease bump steer.
Engine cooling, electric fan behind engine to aid cooling in stop start traffic.
NVH kit to reduce bevel box noise (it's actually very ineffective possibly only changing the speed at when it occurs)
Centa compensator to replace the original design.
Steel rear sprocket the original Aluminium version wears very rapidly.
