Hi, the topic of engine replacement in my head is just around, about which a few questions are still open: What distinguishes the T4 models from “normally motorized”? E.g. a larger braking system or other drive shafts? Other cat? Larger exhaust pipes/smoke dampers? Does the T4 control unit Plug & Play fit the rest of the electronics? Other coolers? Does the T4 have an LLK? Are there any problems installing engines from phase 1 in phase 2? Did I forget something that comes up to you spontaneously? Please enlighten me mfg Christian