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...a "tuned" intake uses acoustic(length)/mass(diameter) inertia to cram as much air INTO the cylinders as possible.
...a "tuned" exhaust uses acoustic(length)/mass(diameter) inertia to extract as much exhaust OUT of the cylinders as possible.
...working 'together' it's possible to achieve >100% volumetic efficiency...but, ONLY at the "tuned" engine speeds!
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