I tested an eBay-bought D-CAN cable with my M3 and it worked in communicating with my car -even "talking" directly with the CIC- and for diagnostics.
However and unfortunately, I will not be posting or answering any questions about the details of this interface as this is a quite dangerous software tool if the user does not know anything about how this works. You are on your own.
The purpose of this post is to confirm that the cable works with E9x from 03/07 production and it is being sold at eBay for just $99.
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