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I'd agree with Frank about the lack of smooth airflow at the base of the windshield and the minor effect the wipers have there. I have lowered the wipers on my Caravan for two reasons: 1. In stock position they sat almost in my line of sight. 2. The angles of my hood and windshield are close (Frank's 1-box idea) and I felt that some improvement in air flow could be had. No science here, just looking at the profile of my van and using my imagination.
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