One thing I did was purchase a matting to go under the carpet.
I don't know what they call it but it is made out of scrap cloth pressed and
then an aluminum foil material is attached to one side.
This stuff is a bear to cut but it adds a large amount of sound proofing as
well as heat barrier.
It's cheap and I bought mine at a Pep Boys in the US, I would imagine that a
bunch of stores sell the stuff. I did not glue it down, It kind of forms to
the shapes, the firewall and sides are glued.
The carpet is just laid on top of the aluminum.
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