Hmmmm could think that the holes are there for a reason. Wonder how the air flows through the pipe...maybe these holes are there so the small amount of air that is sucked in by them "twists" (this is not the right word but can't remember it right now) the incoming air in the pipe so more air gets in the engine :huh:
you forgot about the radiator at the front so hot air is still getting under bonnet and the pipe bends right in front of it so those holes will drag in some hot air
I would have to disagree with the "vortex" idea. To me, those holes are for air to partially escape from the pipe. The reason is the "near-to-wall" regions in the pipe which cause substantial instabilities in the flow field due to friction (a good example is a Couette flow). This ultimately changes the velocity fields and thus the vortical behaviour of the flow itself (vorticity is just the gradient of velocity). In this pipe you need the air to be as smooth as possible (low Reynolds number laminar-like flow). The holes help the flow to naturally stabilize itself.
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