JB4 Replacement and Upgrade Chips Billet caps D-744-4 for all 2016-2018 BMW

D-744-4 for all 2016-2018 BMW 230i

5" catless downpipes are backed up by a lifetime warranty

CompatibilityThis system is suited

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JB4 Replacement and Upgrade Chips Billet caps D-744-4 for all 2016-2018 BMWDescription JB4 Replacement and Upgrade Chips The replaceable 2580 master chip controls the communications between the JB4 and your BMS data cable or JB4 Smart Phone Wireless Connect Kit as well as the model specific firmware. If unable to connect to the JB4 try replacing this first as often it's the culprit. Be sure to specify which firmware you need in the drop down for the chip to work properly with your model. We also have 2431 and 24K22 port