It is completely silent and tight solid while in action. In fact, just the other night around midnight, i was playing F1 2019, and the wife angrily came out to the living room asking what is making all this noise.... it was the FFB turned up to 11, but nothing to do with the rig itself.
The only time it gives out two squeak is when i sit down on the seat or stand up to get out... I think it's the squeak due to the friction of the wooden baseboard of the seat with the PVC.
It is all PVC. YOu remind me, maybe i will add 4 plastic gaskets between the seat baseboard and the PVC to prevent the squeak during ingress and outgress... but otherwise... silent and removable.