Once you lock the car, it takes 10 mins to power off all systems. If you want to make sure, you can disconnect the battery. However, I have installed and removed the JB4 3 or 4 times and not once did I disconnect the battery. I had no problems. Disconnecting the battery is not necessary but if it makes you feel better, then do it.
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PTF Map, Pure Turbo Stage 1, GFB DV+, Mfactory LSD, AA FMIC, B12 Pro Kit, M3 FCA, AR DP and
Dynavin N6, Mosconi AS100.4, AS100.4, AS200.2, Micro Precision tweeters & woofers, Esotar2 1200
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