It's the same as always with you, putting words into my mouth. I have never said it has to be a wedge shape, the picture I posted were merely to show how a nice plenum looks like. To me that is a plenum that doesn't have big flat surfaces (if they do there should be pins welded in) to avoid expansion which can result in cracks at high boost, avoid sharp edges to the best of your ability to promote air flow. I never said anything about performance or size, even though the one I posted first is big enough to run 750 hp despite looking smallish.
That F1 plenum is outrageous, in a good way. It may be boxy but it has no sharp edges, if sharp edges didn't matter...
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