The middle mudflap comes from the world of rally cars. It's supposed to protect the rear suspension from things that the front wheels kick up. The problem is that to be most effective it should be mounted further back and more inboard than the Weathertech one which mounts on the running board.
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I am on a lot of gravel and they help a lot . Before them you could hear rocks steady even with the underside of the boards coated .
Now it s way less noise.
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