Interesting observation that would be great as its own topic. Let’s keep this thread about the question asked by @Luke ThomasSpeaking of cabin noise; the other day I was crawling around under my (new to me) CX-5 and I noticed that the whole bottom is covered in this really wild cardboard type of product. Bolted everywhere even in the wheel arches. I have never seen anything like that in my life! Wild stuff but it seems to keep the noise in the cabin down. I worry that in the long term that moister will get trapped behind this board stuff and cause rust behind it. Has anyone seen that in high mile Mazdas?