The rear deck panel on my corolla has been rattling pretty badly recently. It happens every time I hit a bump on the road, no matter how small. I like my bass pretty heavy and since the rattling is from rear dash panel right in front of the sub, my friends think it's a by-product of me having the stereo on too loud--maybe all the sound vibrations weakened the plastic or something.
If I took off the panel and dynamatted it, do you think that would help the rattle go away? Or should I take it to the dealership and have it looked at? (and btw, this would be considered "normal wear and tear" in the Warranty exemptions, right?)