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Is that not the whole point to them that they give a bit of passive rear end steering?
I know it is the case with the LCR rear end
nope it is not passive steering it is uncontrolled toe change under load through a high speed corner...... which is upsetting the balance of the car. Once replaced it was stable and faster again per lap.
It has shopping car, "dont want any road noise coming into the cabin" soft as you like compliance void bushes. Hideous under load and duress.
Competition cars remove these deformable bushes as geometry is unpredictable under load.
Far better more stable car once replaced (ibiza)