Call ARB USA. I had a problem with my Rubicon sagging in back with the medium ARB springs they recommended, and they replaced the rear springs with heavies no charge. (I had to crawl under and swap them, but the springs were free.)
My point is, back then anyway they had really good customer and...
I think in general the MSRP increases will eventually need to be rolled back some. The Bronco Raptor increases for sure were way too aggressive, and a two door Heritage Limited at what was a 4 door Raptor base price is just crazy too.
So, I am trying to remember but there were two plugs into the head unit, a black one and a gray one. Since my pic up there shows the sub wiring in the gray, then the other 4 channels are in the black one.
The amp plug-n-play harness I bought plugged in between the 4 channel one and the head...
My dealer just did this in addition to the seatbelt recall clip and fixing the brake squeak (no grease on the back of the pads) and squeaky side step (retorquing the bracket bolts - which ai would have tried myself but they are steel bolts in an aluminum step and I wanted them to take the risk)...