That's what I figured but it seems that people are bringing up both in the conversation so I though I would make sure. I guess I will ask my engine builder when the time comes.

 

Car is close to firing up. Fluidamper and OEM stubby shaft. Will report back on vibrations. No way to tell if its better unless you tear down the motor after use and compare with a motor same setup using OEM. No one does that unless they are fixing something that broke. Never heard of a problem with Fluidampers.