This
problem really is the thorn in my side with my car, I have also had mine back and forth to my local seat garage and had many things replaced like steering rack, front and rear dampers and something to do with the steering column (can't remeber everything without looking at my file!)
The garage has said to me that they have done everything they possibly can and that any other parts on my car are all sound like the droplinks, bushes, top mounts etc etc.
I'm thinking of trying again as my warranty runs out soon but might try somewhere else as my garage seemd like they had enough-which is sh*t on their part.
The only thing I've heard that it could be but I'm sure someone else on here will tell me different is that when you have a sporty suspension setup even standard ones (like mine) that the surrounds for the suspension mountings become more plastiky than rubber and therefore make more of a noise-
help me I'm guessing!
As you can tell I'm not a grease monkey or technical! And I'm clutching at straws!!! but I would love to know whats causing mine as al ot of peole complain about this on here.