some story now...
MK Motorsport was founded by Michael Krankenberg, and as a race driver he achieved to get 3rd place in Nürburgring endurance race before many official teams.
https://en.wikipedia.org/wiki/MK-Motorsport MK Motorsport is one of the few approved tuner by BMW.
They are not building cars like Alpina or Hartge, they sell "performance kit" and mainly turbo add-on.
for Their commercial need they've build only one of each motor to get the larger press feedback.
For E36 compact they've build 316ti, 318ti on different kind of motor (M42 / M43 /M44).
My car was their former press car for M42 in mid 90's
I've managed to get some press release, where one can see licence plate :
bottom right my car :
the French administration incoming approval for owner licence, MK plate is the same :
this means that I'm the happy owner of this former press-trial car !