My experience after replacing engine and tranny mounts and all exhaust hangers is that there is still a resonance that I wouldn't expect you'd find with a smooth inline six. I think you'd be fooling yourself to expect to cure it with any sound-deadening. However, it is not there under hard acceleration or cruising - just in a certain rpm range under decel or light load. Keep rpms up to minimize it, and the tranny shift points can be optimized, both for smooth shifts and minimum resonance.

Most Jap cars have intake resonators to eliminate the problem, but the 190E does not have this.

Steve

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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7