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I don't have side skirts done and haven't noticed anything hitting them. The M4/M3 already come with some film in front of the rear wheel. M4 actually has quite a large piece. I guess BMW noticed rocks would hit that area because of the flaired fenders.
Make sure your mirrors include the black area below the color cap. I've noticed a lot of crap hit there but no issues since that area is covered on my car.
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