I have a leaky door, water doesn't get through, but wind noise sure does. wind comes off of the mirror, and some is directed towards the window, causing an aweful noise of wind spinning and flipping in odd directions. it's kinda like when the wind is blowing uber hard outside and you hear it whistling. If you don't have that wind smacking the window and weatherstripping, you have a quieter cabin.
One thing I do like about my leaky weatherstripping is I can use it to help with FE. When it's really loud, I know My FE is gonna be bad. When I get behind a big rig, I know how far back draft from and benefit, because when it stops being loud, I'm drafting good, go too far back, here comes the wind noise...
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