In my weekly update phone conversations with the head of the X6 project and top Dinan engineer, the limited production was in reference to only offering the software upgrade. I think they are debatig the suspension, brake, and exhaust upgrade opportunites for this model. Although the 750 has the same engine, the software on each new model is more and more complicated, to the point Dinan believes in the coming years they won't be able to work with any new BMW models. BWM is essentialy locking them with their software coding.
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