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the side mirrors on some vehicles are in a low pressure area, that is why they put them there. check around it with your hand or better yet tape little pieces of yarn to it to see whats happening before you panic. i know on my car the air is coming off the windshield more horizontal at the sides and doesn't get back to the window until half way back. keep in mind when you change something up front it changes the flow around things on back. i had one configuration where i diverted most of the air around the sides, then the mirrors made a difference.
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