JB4 S2 on N55 stutter between 4-5k when cold?
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01-03-2013, 03:34 PM
BimmerPost Supporting Vendor
Drives: 2007 335i, 2015 M3
Join Date: Dec 2008
The JB4 is different between each platform. So your best bet is to check with other F10 owners as it has its own special software and tuning different from E90 N55s, etc. There is no JB4 for the F30 yet. Only the Stage1.
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