Originally Posted by Alfred
I think as long as you can hear the rattle (as long as its not considered normal), they'll replace them.
specifics from the SIB:
A slight rattle noise is considered normal operation of the mechanical wastegate valve and is not a failure of the part. No repair should be attempted for this type of rattling complaint.
If the noise is described as a clanking noise occurring up to six or seven times in a row during adeceleration from approximately 3,500 RPM, or during a heavy application of the accelerator without a drive gear being engaged, then continue with the procedures described in this document.