I've got a 22 ltd with 5.3/10 spd.
I had the exact same noise.
Eventually dealer found that retorquing my u bolts fixed the issue, which it did, however the noise has returned since the retorquing.
Last time I was at the dealer the service manager said the noise was caused by my wheels.
(The noise was present with the stock wheels also)
They are going to be replacing the u bolts when they arrive (on backorder)
Hopefully that fixes it, interested to hear about anyone else with this issue.