[olrocker]

When I used to do car stereo installs 20 years ago one of the things I always tried to look for when I was working on a car was an easy way to run the main power cable from the battery (when they were all under the hood except BMW), through the firewall, to the trunk. The one thing I always hated to do was drill through anyone's firewall and I'd always leave that as a last resort and make sure the customer knew I was doing it and was ok with it.

That hole for the sound tube would be PERFECT for running the cable. I'd have been doing the happy dance whenever I had a car that had such a perfect placement of a nice, large, pre-drilled hole.