My '96 car has a loose fibre pad (like a loose felt) about 30mm thick under the carpet over the enginer cover.  I've assumed this is original as it is cut neatly round things like the seatbelts.  It has some very hardened bituminous sound deadening material stuck to it.  Is this original too?  The pad is tearing, attracts damp and a bit pongy.  The bituminous material is falling off.  In short, it's bit manky.

I'm inclined to replace it with two pads of cellular foam rubber sound deadening, probably 25mm thick and cut in two pieces to make it easier to get in and out.

Thoughts and comments welcome.  What are other people doing?

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