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There's a difference between putting on a layer of sound absorbing material and physically blocking bass from entering the cabin. The lowest bass still could come thru after I stuffed those tunnels with ceramic fiber, because the longer wavelengths can travel through barriers with less...

I installed the front fender foam at first and noticed some improvement/reduction in noise subjectively (I don't have time to perform a controlled measurement after every change). I next installed the rear seat bolster foam and also noticed that reduced road noise from the back (now the road...

Thanks for all this information! I have a 2023 M3P with Pirelli P-Zeros. Road noise isn't bad until close to highway speed. Wind noise really is not an issue. I ordered the 4 mil closed cell-foam and ceramic insulation and will be implementing the front quarterpanel and sides of rear seat...