Here is a comparison video I did. It accounts mostly for motor mounts but you can see how quiet the second car in the video is. Both are 1983 300SDs.

http://www.youtube.com/watch?v=tHFhjbAg8MQ&list=UUX3YyyjeCyrrjETZIhZm95Q&feature=c4-overview

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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge