Pay in 4 interest-free payments of $100.00 Learn more
Ships within 48 hours · Estimated delivery Aug 22 - Aug 27
durable finish
MONOBLOCK CONSTRUCTION
driving excitement
Matt Black version comes with replaceable stainless-steel rim protector
BMS 2015+ M3/M4 S55 JB4 durable finishThe 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
