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I thought I read somewhere that some of the aerodynamic plastic shields under the car are added extras you pay for at the dealer. However, the aerodynamics is a big part of this shield. Secondly, protecting parts. I'd replace it with used in near new shape or new. I've noticed on my 2006 Subaru and on my 2007, 2013 Honda CRV's, these shields exist and I am quite certain they provide the aerodynamics to boost the gas mileage up to high 20's or low 30's. The wind drag properties really work.
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