Quote:
Originally Posted by ahausheer
Stick a finger in it and see if there are soft rubber flaps on the other side. If so, its to balance air pressure, like when you have the AC on full blast, the pressure has to go out somewhere. If you ever see a car with its rear bumper off you can see the flaps.
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Tour right its a vent. You do think it will be a problem to block the airflow? I am putting sound deadening in my car