Nice - I was just logging in to post this very same question. I noticed these bags just kinda floating behind the fenders on either side of the engine bay. The previous owner of my TC lived in south Florida, so it got my imagination racing, haha. It's really strange though, it just feels like it's polyfill in a sealed plastic bag. The way they sit in there, I can't imagine it has any effect on sound transmission or insulation. It's too lightweight to reduce vibration, it doesn't fill the space up in an airtight way. The plastic's not going to let it absorb any oil. I wonder if it's just some kind of placeholder used during factory assembly, and leaving it in there is cheaper than taking it out.