I could off course have been a small comapny in the US modifying BMW but in has never been in Europe. I have seen in the 80`s some Bimmers with this plate on it but it did not mean anything.
I friend had a old 3,0 si with bavaria but was 100 % stock.
BTW a fantastic car for its time.
0-100 in 7,9 sec was not to bad for a big limo in 1972.
Erik