Hi riparke,Well my dealer replaced the Diff and by the time I got off noisy interstate, I could hear it again. It's either something else or a bad run of Diff's (like I said my 2017 Q4 never made the noise in 32k miles). Tech suspected the drive shaft at first, it's not exhaust, u joint, bearings?
I'm sorry to hear that you are still experiencing this concern with your Giulia. If you plan to continue addressing this with your dealer, please feel free to follow up with me via private message and I would be happy to re-escalate your case for further assistance.