I started hearing this noise about a week after buying my 2018 1SS. It's hard to explain the feeling of hearing this noise whenever hitting a dip/bump and when making tighter turns. Took it into the dealership, but they said they've never heard of the issue. After a few hours they called back saying that it was indeed the sway bar and that they would order some new bolts for it. They tightened the original bolts but the noise came back after a few days. After getting them replaced, I haven't heard the noise since. Thanks a bunch for posting!