Under Dash Shield
Trying to figure out where else can I use my 3M Heat/Sound Shield, I discovered this place:
The panels that cover the underside of your console!
Just measure them up, and fit them on! Very easy!
This is the closest thing that I can find for a firewall sound shield. It really makes a difference. There is one located on the passengers side too.
I will sell two of these pieces for $35 shipped. If you have a W124 or another car, you can send me dimensions and I will ship you two pieces