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I'm not an engineer (never even owned a train), but here's my take. At any given rpm your engine needs X amount of oxygen. The easier it is to get it, the less power it will take from the engine. The flow of air around the edges of the intake tube is slower than in the middle. Dimples will help that if the air is moving faster than about 75mph. They will hurt it at slower speeds.
My Conclusion: There is a point of diminishing returns in tricking out your intake--as well as any other mod. Usually, I've found that mods not too far from stock are way to go. If you've got enough flow now, why do you need more?
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