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None of the W123 chassis ever came with a sound encapsulation panel. The 1987-up E-class (300D, E300, etc) have two, one under the engine and one under the tranny. And the 1986-1995 S-class diesels (300SDL, S350, etc) have them as well. All the older cars have NOTHING. There was a thread here where a guy added his own sound wrap to the engine compartment using industrial 'glass mat, and said it made a BIG difference in noise. Looked like a lot of work, and maybe $100-$150 in material. He had nice photos, do a search and see if you can find it...
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