Started to cover the right trunk inner liner with self adhesive automotive cotton type sound insulation (1 cm thick).
I guess a less stiffer material would be easier to apply, but I use what I have.
View attachment 85288
Yes, on the metal I used butyl, but did not a full cover only on the middle of the sheets according to the AcoustiShield pdf. So the vibration of the metal will be attenuated and the air noise in the cotton plates. I hope so Learning by doing.Understand constraints; however if you can swing it the wheel wells are one of the places you're going to want to use butyl and add a second layer of foam/aluminum blanket. It's the only way I know of to really knock down road noise. Good luck.
The side panel will be more problematic than the roof I guess. The body panels are like a speakerbox. The 400mu Alu did not much when knocking on it. I added some insulation on the inner side of the plastic cover.
I don't think that the room behind is accessible to fill it with some material. But, I made a starting point.View attachment 85554 View attachment 85555 View attachment 85556
Finally, I did a long test drive. Changed a lot. It is like driving with 100 at the noise level of 80. I will add some acoustic wool below the seat belt roll. The roof makes a huge difference. I should have done this years ago.