I am thinking about doing this myself, there is more info on the vs, in the 5 series forums.
From what I gather Dinan is a milder tune. BMS stage 1 550 walks DINAN stage 1 550.
Take that for what its worth. Also for the N63TU its now a piggy just like BMS.. One costs 3100 and the other 500.. I would be annoyed paying 3100 and the guy who pays 5 blows by you.
I have a 2012 650i so its an N63 an Dinan is a flash tune..N63 also has issues with Drive Train Malfunction/injectors fixed by CCP. I have not had any issues, but am debating going with the safer route..even though my warranty is up in march...Since the BMS stage 1 is plug and play and 500..why not try it out? I just may do so myself..
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