2014-2018 Mazda 3 Skyactiv Audio & Electronics
Ok, I'm super cheap and will never spend money on a quality sound deadening product like dynamat, etc. So please know that much upfront.
I do, however, have a king-size piece of (1.5 inch thick) memory foam sitting in my garage. :afro:
Has anyone experimented with this? Wondered if it'd be...