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Tunning a 1 er tuned outside of BMW is not dificult and is pretty much sorted and not that expensive: Proceed, Dinan etc.
However getting the handling dynamic sorted is not that easy or cheap.
Assuming that most of the above list is correct, the 1M should tick all the handling and track day boxes. Then go and put your Dinan etc on top of that and your 1er should be very much sorted.
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