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DB,
Let me just insert my $.02 on the topic of the IPD urethane upper strut mount bushing. There is a noticeable difference, it is by no means (my opinion) objectionable, between that and the factory rubber. I did not notice any increase in vibration, which is to say that any increase that others have commented on is not that great (the I5 is inherently very smooth). What I have noticed is an ever so slight (and somewhat pleasing) mellow sort of rumble that sounds much like what you might get by installing a more efficient exhaust system - not at all loud.
For what it's worth.
Ron
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