here is my experience with the IPD version of the top motor mounts:
1. When I just changed the 1 attached to the top of the motor I got a very slight increase in vibration.
2. When I changed the 1 on top of the motor and the 1 on the firewall, it was way too much and I went back to the original mount on the firewall.
3. I also changed the motor mount on the passenger side of the engine as well.
I assume that each polyurethane mount will add vibration and the combination of the 2 was too much. I hope this helps.
Edwin
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