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Using a naca duct under the tray is a pretty cool idea. I've seen it done before. It has the added benefit of drawing air from under the car where you don't want it. Some have also used a naca duct to blow air at the oil pan for additional oil cooling. My only concern with it is whether it would get a forced air effect to push through the rough corrugated tubing.
Those stock location ducts are a bit difficult due to the routing of the tubing. Nice looking bits though.
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