I think I saw a post here or there about someone implementing a similar solution with PVC pipe. I'm not sure how well it actually worked, but seems like a decent idea. I may experiment with something similar.
Do you guys with Buelltooth devices leave them plugged in all the time or take them out when you're not actively using it? Seems like the heat would do a number on that, but then again, the ECM battery, and fusebox are under there too.