I don't know if this is the same as the factory Alpine unit but if it is, it's just plug and play and you'll be able to use the steering wheel controls on it. Might check with Pacific BMW or Bav auto. I know they are good at that stuff.
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1999 528i 5 Speed, Sport Package, Confortti Software, Racing Dynamics Front Lip Spoiler and Rear Apron, Supersprint Muffler, Angel Eyes Upgrade.