I'm not speaking exclusively, or even primarily of American V8's. That's merely one tiny portion of the conversation. The main focus here is modern, factory balanced 4 cylinders. Eagle and Scat produce cranks, mains, rods, etc, for all engine types. They found the thought of replacing a factory damped crank pulley with an un-damped pulley absurd and potentially destructive.

This is different than an OEM supplying a solid pulley from the factory.

BUT, since you're using Porsche as an example, and specifically the GT3, you'll be super excited to read the following: http://performancedevelopments.com/p...enginefailure/

Performance Developments is a high-end Porsche engine builder, though, that document was actually authored by RKAutowerks, another noted BMW and Porsche tuner / builder.

I hope you found the section titled "Crankshaft Torsion and Dampers:
Torsion — The hidden problem with the crank system — and why it needs a damper" especially enlightening.