Posted by Sean on February 20, 1999 at 02:34:48:
Just came back from Automotive Entertainment in Santa Monica
and they just received an adapter that allows you to use an aftermarket (Sony or Alpine) cd changer with the prewiring in all 99 3 series (with I bus). It's also suppose to add features to your headunit (like random search) that is not available normally. I looked at the instructions and it DOES NOT work with vehicles equipped with AI bus. It says it works with any I bus system. The adapter is made by Soundgate (soundgate.com). Price was $150. Seems kinda steep, maybe you could get it someplace else cheaper. In anycase, it's a helluva lot cheaper than buying a OEM BMW changer! Enjoy folks.