Originally Posted by Modshack

Yes.....I've had lots f Audi buddies replace their heavy dual mass flywheels with solid billet lightweight versions only to get LOTS of gear rattle..
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The break point on at the audi's, when putting in a new (one piece) flywheel seems to be 17lb. That or heavier and the noise is minimal, a 12lb aluminum will rattle your fillings..