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Originally Posted by Auto
It didn't work so I need a Combox. Do I buy stock? Can i retrofit it myself? Help! 
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Originally Posted by theaudir8fan
depends on if you have the combox or not, if so it is built in to the idrive, if not, than it won't do it as is. Combox is retrofittable tho
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Yes, you can technically do it yourself. You need hardware and coding. Check out bimmertech. I believe it's 1k though so it's not cheap. Someone else that has done it can chime in with more details.