Here is a quick video of Roxy getting a dynamat kit for the hatch area. The previous owner stripped the factory stuff, and the car no longer has insulation or carpet, so the Mac mufflers really echo back there, and this kit made a world of difference.

FOX BODY MUSTANG HATCHBACK DYNAMAT XTREME CUSTOM-CUT TRUNK FLOOR KIT 79-93:

https://lmr.com/item/DYN-XFOM3T/musta...

FOX BODY MUSTANG HATCHBACK INTERIOR HARDWARE KIT 87-93:

https://lmr.com/item/LRS-8793424/must...