Driver's side behind the "fins" between the door and the fender.
The ECU is mounted where my stock ECU was, and the injector driver box is right on top of toe box.
The factory ECU was relocated to the passenger side under my dash I believe (never actually looked for it)
That is how you do it on a gen 2 but this is a gen 3
Drivers side on top half under the windshield cowl. Just used some 3m lock so can remove easy. Did you get everything worked out?
The painted panel comes off with 3 torx screws without removing the side sill.