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Old 02-02-2013, 03:55 PM
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Shigeta Shigeta is offline
Old Soul
Location: Hayward, CA
 
Join Date: Dec 2011
Posts: 2,943
Mein Auto: '96 328is
Center vent

The center vent is the main supplier of air in terms of heat/AC and blocking it will allow about ~20% of the typical airflow though.
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