I've just noticed a knocking coming from my steering when stationary. If I 'wiggle' the wheel left and right a little bit I can hear something deep in the bowels of the engine going knock knock knock. As if there is a bit of play in the steering or suspension or something? I fitted my Sportlines today and can't say I have noticed it before (doesn't mean it wasn't there though, I dont make a habit of sitting in my car wiggling the wheel )