...lookup "Helmholtz Resonator" and "quarter-wave shorted stubs" and you'll find that length tuning can also be used to ensure that exhaust pulses from one cyclinder do not interfere with exhaust pulses from another; it's all about timing and lengths; been proven over-and-over again with use of "Tri-Y" headers, first on WWI airplanes, then on cars.
...lookup "acoustic impedance" and "collectors for headers" for applied information about how/what happens as the hot, high-pressure, exhaust gas slug sudden encounters a change in media (ie: confines of pipe to open atmosphere).
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Originally Posted by Old Tele man
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