The JB4 is plug and play, all I do is disconnect the battery, unplug the harness and disconnect the OBD cabling to the controller tuck it away. I have only needed to take it in for normal maintenance (ie. oil change, inspection..)
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Can't stop the //Addiction...2020 Misano M2CS 6MT - New Toy
2018 m240i b58 - Formerly owned / BMS CAI / VRSF DP / JB4 map 2 - 340WHP; 363TQ
2016 328i xdrive n26 - daily
2015 GMC Sierra 1500 - daily driver
HEUSING240i
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