e60 535i JuiceBox4 / JB4 upgrade

e60 535i JuiceBox4 / JB4 upgrade

My initial motivations for buying an e60 535i were completely practical. I’d looked at an older e66 760Li (my previous two cars were V-12 7-series cars), I looked at a pre-LCI e60 M5 as well. I was scared away by the potential for some major failure, and the...