Dude, you should really think about scrubbing your personal info off of anything you post to the internet. I would take that PDF down and white out your personal information before you put it back up.
Not everyone on the internet has good intentions.
As a previous ford dealership tech, I can tell you a lot of warranty work is wind, water, and noise related. As others have said, take it to the dealer and let Ford fix it.
You can cut a slit n the back of the head rest very small. I used an exacto knife
and made the opening just big enough to where the material stretches around that hook piece.
You don't have to go through the firewall at all. I run a pioneer AVIC-8200NEX and run the XM/Sirius antenna from the back of the radio to right under that center dash grill. No issues with reception.
This is where I put it (about 5:35 into the video)
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you can just pop off the center grill and put the XM antenna there. Use the flat meta base that came with the setup with the sticky take on one side. It works perfect and you cannot see it when the center grill is put back on. I put it right next to an aftermarket GPS antenna. works fine.
I just replaced the P-Zero's with continental extreme contact DWS. I didn't notice a decline in handling and it's good in the rain and light snow.
I have a '17 GT PP as well.
I haven't actually been pulled over for no front plate, but if you don't have one on that gives them a free pass to pull you over whenever they feel like it. So for that reason I use one.