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Hello,
I have small recesses with fog lights on my xA and covering them definitely was noticeable.
My theory is that the air flow is smoothed out, and it kicks out more cleanly, and goes around the front wheels? If you look at the front spoiler on (older?) NASCAR racers (pre-COT), they have a flare on the lower corners that does this -- they sometimes tried to "cheat" by increasing this.
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