Brand new never installed piggy back tune.
M5's have seen anywhere between 30-40 whp and 40-50 tq increase. Asking $360.
More info can be found here:
http://www.burgertuning.com/N63_Jb_B...nce_Tuner.html
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Current: 21 M5 Comp, 23 M3 6spd, 23 i4, 20 Tundra TRD PRO