There are a number of resonances that occur inside 2 stroke expansion chamber performance exhausts.
Some of those serve no function at all while others do within certain limits.
But above all none are fundamental to the gain provided in performance and power by the expansion chamber.
That function is driven entirely by sonic wave scavenging.
This series of videos covering the various types of resonances and how they effect the performance of the exhaust system.
Freeware 2 Stroke Expansion Chamber Exhaust calculator program
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