So I have a 2013 Audi A6 Quattro and for the last 2 months I have an awful creaking sound coming from the read end when I go over small bumps are very low speeds. I have taken it to 2 different mechanics... the first one sprayed the bushings down and no difference. I took it to another mechanic who unbolted everything and set it back down and retightened the suspension components... still no fix. The guy is telling me now that it is probably my shocks.

I have Eibach springs that have been on there for about 3 years now.

I have attached the link to hear the sound. Can anyone please tell me what it may be as I am literally going insane.