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From all that I have read, It seems the Dinan Stage 2 is about on even par with the BMS piggyback. I have had Dinan products on my 2011 550i and loved them. But, for almost $3k more for the same HP gains, I may have to go BMS this time.
wrsbmw, thank you so much for your insight into the Dinan product for the F10 M5.
Thanks
BB
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