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Old 12-22-2011, 09:44 PM   #26 (permalink)
MetroMPG
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This is a great thread.

One of the additional effects of your wiper deflector is it covers the fresh air intake at the cowl.

Restricting flow into the intake there may be similar to the concept of a grille block: better to send air around the car than through it, unless you need the air.
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