I was just wondering what the use is of this line connecting the 2 WUR's on a 400i. I understand that because of this line both K-jets will have the same control pressure. But is this really the case, if one independent WUR has 4 bar of control pressure and the other one 1 bar that they will both run on 1 bar control pressure? If this is the case why did they not choose to use just one WUR. I'm interested to know because I have a car that did not drive perfectly, one WUR was closed all the time so pressure test revealed 5.5 bar (system pressure) on this WUR all the time. Could this influence drivability if the pressures on the other side are spot on?