Need quick info on disconnecting stock ecu?
Do I just unplug and pull through the firewall or are there other ways
Any advice would help

 

I don't think the plug will fit through the firewall but maybe it will if you turn it sideways. I think I remember people saying it is easiest if you remove the harness from the ECU and then pull it through but if you are disconnecting it anyway, I would just unplug everything from the engine bay and pull it through the firewall the other direction.