Ask EALm4 he has a jb4 but controls his meth. He might be able to help you about the jb4. He just dynoed his car as well, 510whp and 622wtq !!!!!! Insane
http://f80.bimmerpost.com/forums/sho....php?t=1435169
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2020 Alpine White M340i X - Stock - DP
2017 Tanzanite Blue M4 ZCP - DP, bm3, mpe
2015 Alpine White M4 - Stock