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No one has really touched on the fact of why BMW placed the OEM scoops like they do:
1) Keeps dirt and sandy debris from flying directly into the intake. Not a huge deal considering the car is running a filter. It simply means the filter might clog up a bit faster.
2) Most importantly, the air slamming into radiator at speed creates pressure on the frontal face of the radiator, thus the air pushes itself into the intake scoop placed directly in this area and as the intake is sucking in air, this pressurized air will take the path of least resistance and head for the scoop. This improves throttle response (maybe power but only VERY marginally).
By placing the scoop forward facing, you lose the pressurization effect. It can also create turbulence along the leading edges of the scoop, thus somewhat lessening the ability of the air to shove itself into the intake and ultimately taking away some throttle response as well.
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The forest was shrinking, but the Trees kept voting for the Axe, for the Axe was clever and convinced the Trees that because his handle was made of wood, he was one of them.
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