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All of a sudden there is a cavitation sound from 20-40mph inside the cabin with the windows rolled up. It is hard to describe, not really a sound but more an in and out pressure on your ears.

Wonder if it is the air dam underneath that is loose? Do I even need that thing?

17JKUR with a 2.5" lift and 34s. Nothing else yet really...
 

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Is it like a "WUB WUB WUB" like the entire cabin has been turned into the chamber of a giant whistle?

If it is it's called dynamic pressure flux. At least that's what we called it when I flew 47s. If the cabin isn't sealed and the opening is just the right size it literally turn the cabin into a whistle interior.

If you open a window wide enough it makes the opening the wrong size to establish a resonance chamber and it subsides.

I'd say check every window, zipper, drain hole, gate bar, door seal... everything.

If you don't find anything unsealed.... I'm out of guesses.
 
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