They are the vents for your flow through ventillation system: exits out your trunk.

I have eliminated a lot of the the vibration by using sound deadening applied to the inner panels. Works very well. Makes the doors close with more of a clunk.

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)