Hi After6,
If your ride is a Z4, your Radio is actually a worldwide radio (doesn't matter jap or non-jap specs...b'coz all are manufactured in the USA). You don't need to install anything to receive M'sian radio channels. All you need to do is to SET the radio to "Asia-Pacific" area....to receive M'sian channel. The set-up procedure depends on what radio option (i.e. the Business Radio-CD or the CID radio) is installed in your car. If you're n't sure, go over to AB or Sapura. I'm sure the technician can help you. Else, report here the radio type you've. Perhaps then, someone could advice you the self-set up procedure, which is quite easy.