Quote:
Originally Posted by greentrbo95gst
I just picked up my 21 M5 comp yesterday and I have been trying to decide between BM3 and JB4, but hard to find good opinions these days. I even asked several vendors on this board with no response.
Are you guys able to tell me major differences between these two and main things I should be concerned with? Thanks
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No ECU tunes available on 2021s yet. When my car is delivered in March I will be playing the waiting game also