Very nice work 310Z, Some people hate doing these types of modifications to older cars, but oh well - What ever makes us happy! It all can be removed, and reverted back to factory original, used only the original floor panels as templates, so the originals are still stashed away. It weighs a bit, but nothing major
I just built a box to fit inside the well, so it can be removed easily. I've gone the route of a complete fiberglass enclosure using the floor pans as shape, and I wasn't thrilled with the sound it produced, so I tried something a little different. I did use a shallow mount 12", and it's plenty of boom for this small car, lol