Quote:
Originally Posted by Diper
No it is the plastic that is able to resonate against the glass due to some play, which need to be there as the both react differently towards temperature differences
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I'm pretty sure I fixed the issue, I removed the flaps on the two one way valves on the drain ports by the top of the lift gate. I tried a bunch of hard accelerations with the windows down yesterday and to my surprise, no horrible flap sound.