4AWG is fine for battery to dizzy block and to fuse holder and i just used the existing cable from the starter motor to dizzy block. Its what ive used with no problems at all.
Dont forget that the port on its own will have the cable from the boot go to it not the other way around after all that port will distribute power to the other ports IE starter motor and fuse box, and WMI in my case
IMO this is wrong. Or i could be wrong?
The starter motor wont be the item distributing the power to the other cable.