I haven't used a JB in forever but I don't think so. With the backend flash the JB4 just becomes an expensive boost controller. Fueling, timing, everything else is controlled by the BEF
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335is/DCT-M3 GTS software-M3 drivetrain-M3 GWS-KOMBI-DSC-SZL/MHD/BQ Tuning IG@ClustersandCoding
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