Installed my Icom ID-5100 in my 2017 Denali this past weekend. Very happy with the results.
Used a Greenlee chassis punch to put a hole in the roof. Ran the coax down the rear passenger pillar and underneath the rear storage area to the radio.
Radio body located under the rear passenger seat. I bought a cheap cutting board and mounted the radio to it and secured to the floor with outdoor Velcro.
External speaker attached underneath the rear seat. Drilled holes for the bolts and a hole for the speaker wire. Cant even see it when the seats are down. Speaker points directly at my right ear.
Used a razor to slice a slot in the carpet and ran the microphone and control head cable from the rear seat, along the driver side of the center console, and then up behind the USB/Aux and 12V port. Used a dremel to cut holes and installed flush mount RJ45 and RJ12 panel mounts. Microphone plugs into left side and control head on the right.
Microphone hangs on drivers side. Easy to access and does not interfere at all.
Used a Ram adhesive mount for the control head. It was attached to the bottom of the cubby hole but would not hold. Attached it to the smooth wall opposite of the USB and panel mounts and it is solid.
Power ran from the battery, through the firewall where the clutch would be on a manual transmission, along the driver side door well to the back seat, underneath the carpet to the radio.
I had to remove the storage area but it was really easy. Just unscrew the metal bolts and the plastic carpet screws and it comes right out. There are cut outs in the carpet for the metal support rod and that is where the power line and coax popped out.
I realize this install is not for everybody. You have to drill holes if you don't want wires all over the place. I wanted a clean and professional look and am very happy with the results.
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