Originally Posted by Zeus

Was that my article? lol...I ended up putting the sub in the trunk. 10" sub in a ported box. The bass is great, although I am planning on cutting away some of the thick underpadding in the first aid area to let a bit more sound into the cabin. On my w124, there are existing holes cut in the sheet metal of the first aid kit area. So I'll leave the upper and thin layer of carpet and only cut away the lower underpadding. This will essentially create a stealth port into the cabin and the thin carpet will allow the bass to pass easily.

As far as mounting a sub directly into the firt aid kit well, it's been done and there are threads on it here. I suppose the two options are to either install a free-air sub there, or mount the one you posted into the hole and build a box around it, on the underside of the rear shelf. That would definitely be a nice option - you would probably get great bass response from mounting to the shelf, and you wouldn't lose trunk space, plus it would be a clean install. Good luck!

As to the hunk of wood - not sure. Your gas tank is probably right below it, so be careful cutting/drilling.