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I tested resonance on what I believe is the most well known two stroke pipe, Gordon P Blair’s Grand Prix 125cc pipe. This 125cc road race pipe is in his book Design and Simulation of Two-Stroke Engines on page 444. All input data for this test matches Gordon Blair’s specifications. Rpm 11750 Exhaust duration 198 Exhaust gas temperature 600 degrees Celsius Tuned length 832 mm, total effective length calculated out to be 1181.5 mm After testing this pipe, it had very good resonance at 11750 rpm and 9315 rpm. The image is at peak power 11750 rpm.