Been under my 407 over the weekend. Before the MOT I suspected that my front droplinks were knocking before i found it was actually the ball joints. Id already purchased the drop links from fleabay both sides £15 good deal that were. So this weekend I decided to fit them and the ones I took off the joints were very loose as opposed to the new ones. Now that the Ball joints and droplinks have been changed the cars suspension is very quiet think ive made significant progress with my knocks and rattles at the front end.