[Emme2]

All mostly great content, except for some claims including that the S55 was put in the M2C because the S58 replaces (*present tense as used by you) the S55 in the M3/M4?!

Everybody knows the N55 of the original M2 (launched in 2014) could not meet stricter EU emission standards and the S55 was ready available while the S58 was still under development (indeed, it has only arrived in the X3M/X4M this year whereas M2C launched a year prior in 2018; new S58-powered M3/M4 won't come until 2020 - *future tense used by me).

The S55 implant happened because BMW did not have a new in-line 6 cylinder S series engine available in 2018 and because the M2C was developed to be fitted with OPFs (ie particulate filters) and thus meet the new EU emission standards. Notably: (1) F80 series M3 could not be equipped with OPFs; (2) this requirement is only relevant to Euro and UK cars only, since most export M2C are exempt from needing OPFs unlike new and future M cars.