mcmaster is a great company for all industrial stuff. i bought all of my wire loom there.
i used the black 1200 deg high temp fibergalss stuff. the white is sock like and hard to fish wire thru.
the 1200 deg black has a little rigidity to it and was easy to use.
i used shrink wrap at the ends to help keep it from moving
here you can see it run on the intake and disappears into the firewall. i did the whole car with the loom.