I had a big chunk of 1" foam rubber left over from a project and the red-head was in a throw everything out of the nest mode. Instead of chunking the foam in the trash, I pulled the floor matts and cut the foam to size and installed it under the floor matts.

It does help the road noise and it is very cushy under foot.

However, I lean towards a new muffler. Mine still "looks" great...but after 23 years of use, you gotta wonder what is still left inside!

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Mark
1983 300TD Wagon
Even a broken watch is right twice a day