PCIe does not come out of box. See block diagram. Stays inside for expansion ring connection. This is TRL9 design approach. HAT signals, GbE, USB, HDMI, etc t

PCIe does not come out of box. See block diagram. Stays inside for expansion ring connection. This is TRL9 design approach. HAT signals, GbE, USB, HDMI, etc that come out are all appropriately protected or conditioned to meet EMI requirements per product spec. All of this is TRL9.