I have something similar to NoiseKiller in my 245. I needed to remove the carpet because the aircon drain got blocked and was dumping fairly large quantities of water on the floor. Thought I might as well add sound proofing. It didn't make much difference, but I had the soundproofing bug, so I put some under the headliner. That made the biggest difference of all (I did floor, firewall and under the bonnet). My 244 has what looks like many layers of Waxoyl underneath, and it's quieter than the 245 with all its added interior soundproofing.
It's amazing how fast a job removal and replacement of the interior is (not including the dash).
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 Present: 1990 240GL saloon, 1992 240 estate
Past: 1988 240GL; 1971 144DL; 1972 145DL
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