I have an E70 X5M and was very unhappy with the power delivery (it took too much pedal to get into the power).
I added a sprint booster v3 and it totally changed the vehicle. If the BMS option is similar to the sprint booster, I highly recommend it.
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2012 X5M /// Velos Stage 2 /// xHP Stage 3 TCU tune /// Sprint Booster
2013 X3 35i M-Sport
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