My 325xi is "E" and was definitely produced in Regensburg.
I was told that all xi models are produced in Regensburg, although it is possible tha tthey have started producing them in SA. I also thought that only 325s were being produced in SA, although again tha tcould have changed.
I was told that all xi models are produced in Regensburg, although it is possible tha tthey have started producing them in SA. I also thought that only 325s were being produced in SA, although again tha tcould have changed.