Probably the sleeves that the rack bushings mount on. It's a known issue. I think there was a TSB about it. A quick search on here should give you some info. Mine never creaked, but I went to MM bushings pretty soon after buying it.
Ran them on two cars with stock K members. No issues at all.I just ordered the mm aluminum bushings. Anybody use them? And from what I read on here a lot of people liked them.
I just ordered the mm aluminum bushings. Anybody use them? And from what I read on here a lot of people liked them.