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Ships within 48 hours · Estimated delivery Aug 16 - Aug 21
Center Bore: 72
* Use of high performance linear race springs
MONOBLOCK CONSTRUCTION
Available Sizes
BMS 2015+ M3/M4 S55 JB4 Center Bore: 72The ultimate tune for your S55 powered vehicle, the JB4 allows you to go from factory stock to full race, and everywhere in between, with the push of a button on your steering wheel. The JB4 installs and removes easily and includes many unique features not found in any other tune including user adjustable 1st and 2nd gear boost limiting, map switching in dash, electronic wastegate control, ethanol fuel support, and built in advanced CANbus based
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