SSSix, Chris - I think you may be correct, I checked and they are hollow. I had to poke some crud out of the engine side of the firewall, to find the holes. Inside the tunnel they are the factory orange color - I am shocked at how rigid they are for just a cable protector!?
I have a defroster too, also works a hand towel
If I want to turn up the music, I just sing a little louder!
The horn is finger operated (middle finger)
Smog equipment? uh - I got lots of smog, that tearing sound is the ozone layer.
But it is fast!