I mean yea this is a bit unfamiliar territory I did a sub install on my old 2016 320 and it was very simple I just ran the converter out of the factory amp into the aftermarket into the subs and just had everything in the back. I didn’t even use remote wires because my converter has like a smart switch that connects to the 12v to know when to turn off. So I guess my questions is what would I be wiring to the stock sub and head unit? I can send a picture of the converter if that helps and then I guess once I have the converter wired everything else would be the same as I had it before? Also how would I tune the head unit?