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couple of thoughts.
The BMW sites (mainly 3 series) have an aftermarket-hamman- foglamp/air slot part. the air slot has a hose that leads to the front brakes. This gives some extra cooling for the brakes. I think I have also seen a part that is mounted exactly where you have your circles.
Think about the law of uninttended consequences. most cars have 2 openings. yours has 1. in other words, the mfg has already decided to 'block' the top. meaning that the bottom opening is more crucial to the car than a car with 2.
maybe you warp your rotors six months down the road.
maybe you need to install a higher capacity electric fan to force the air that is blocked
or a larger radiator, or a different themostate.
just my thoughts
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