Sadly I have induced a rattle in drivers door that I only hear when deep frequency plays with no other (like a piano key). I noticed it before putting door cards back on but it's odd. The left most screw area is the reverberation area. So if I pressing on that area it goes away but there is only so much I can tighten the screw. I may have to look at inside the door (window regulator area). Ugh.

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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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'91 850i
'05 X5 4.4i
'09 Clubman S