That is about the Only issue I have had with my car...so it appears I am not alone...
I have not gone to dealer to discuss...it does not bother me, but it is a creak, almost/sort of metal to metal sound (tingle)....had it from about day 10.
So IF you can find out what is really is, let me know please.
I thought it could be rear muffler swinging a little??
I must have another look and see if I can see any wear marks..
I also get it if I do a right turn slowly over uneven surfaces, so to me it is either muffler or rear suspension links/ball joint...OR...see pic.
OR it could be the Auto Headlight leveler pivot arms, MMmmm, it is on the left rear side, the more I think about it the more I think this is where it may come from.??
EDIT: It is a S2 Specific Part Number F189-51-22Y , it has not been modified and is $450 USD!!