About those headlights, there are smal rubber vents on the inside, check if they are in place and make the holes slightly bigger. that shuld do it. My dealer tid this for me on my E46

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X5 4,4i-06 Current
330Ci Cab-03 2007-2008
MB E55 AMG-03 2006-2007
Z3 2,8 Roadster-98 2006-2007
X3 2,0d-05 2005-2006
320d-99 1999-2005