- Dec 12, 2021
Yes, even my 2022 M3 has the PU on the trunk liner but it is not facing the cabin side. It is facing the inside of the trunk space.okay, had couple of hours spare earlier to be in my shed.
NOTE - I did over do the C-pillar edges and had to trim some materials off before the panel can be re-fitted flushed (the pictures shown is before I did that final trim..). Not sure if this is different to yours @enemji but my 2022 MIC RWD does some PU foam on the inside of the boot / trunk linings, both sides and bottoms. I remembered when I did the lower boot / trunk compartment LED extension they were on the bottom of the trunk lining but not the bottom tub.
Quick drive around the block seems to have ease the lower frequency road noise but probably did nothing to the suspension impact noise. Then again, that could do with more around the top of strut and the spring isolator.
(Right rear wheel arch)
View attachment 916688
(Left rear wheel arch)
View attachment 916689
(The two wheel arch panels)
View attachment 916690
From what I have gathered thus so far (academic studies on google), a 2” lining of fiber insulation is the optimal thickness and that is why I used a 1” thick fiber roll, one layer on the wheel well and one layer behind the seat panel.
As far as suspension thumps, they are definitely a defining character of the car like any other sports car. All I can say is that the annoying tire noises that were coming through are attenuated.
What is it that you used? Is that Mass Loaded Vinyl? That was good for reducing resonance and deflecting sound, and and not as good for absorbing sound.