On one hand, it makes sense; heavier engine, more compression in mounts leading to greater NVH...on another hand, I would like to see if there is any method to isolate it.

Any idea?

 

The Lindsey ultra mounts are ok on a track car but, even new, they feel like worn stock factory mounts and the nvh is sort of annoying on a street car. There were some fitted on a car I once bought and I was really happy to get rid of them even though it cost me $375 for a pair of Porsche replacements, btw night and day.

 

I don't have an issue with NVH themselves. It was very nice when installed on an early NA, barely noticeable.
On Turbos it seems much more pronounced, and I am guessing this is from the added frontal weight. As long as I can isolate this it should be good.

 

It seems likely the difference would have more to do with additional resonance from tubing and heat shields, etc. on the turbo than with a difference in weight.

 

Good point. Maybe I could try putting some urethane around the back plates to see if it dampens anything.