I don't want to describe what I hear, so I've recorded it. Here's the link: https://www.dropbox.com/s/78wfgeng2j6a0zk/Engine.mp4?dl=0# You can hear it at 0:03 and 0:05 when the transmission shifts the gears. It only occurs if the RPM is not too high or not too low. Maybe at around 3-4000 RPM. It is 150 HP TFSI engine with an s-tronic transmission.