That's what BMW used to do a few years ago... But at least the e46 has a global-spec radio -- you just have to change the mode to Europe or US depending where you are now...jrubens said:
I wish I had known how to do that when I did my ED... FM worked fine since in US mode, it will pick up frequencies ending in an even number, but AM band in Europe jumps every 8 frequencies unlike the 10 frequency jump in the US...