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"Thats the way that I understand it. The longer runners make better power at lower RPM the short ones better at high RPM, so by mixing and matching they could spread the breathing tendancies of both accross the RPM range."
That is what thought too. The Bob Sharp Datsun in-line 6s in the late '70s or early '80s used different length horns for this reason.
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Lew
I'm no expert. 
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