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And in simpler (simplest) terms,
A "H" piece is more like a header
A "X" tube is more like an extractor.
A full twin system has more noise from nodal and antinodal pressure waves.
A H pipe is really a good pressure balancer.
An X pipe more of a flow and pressure equaliser.
I did play with some bigger valveless pulsejets a while back and gas flow dynamic stuff can become real heavy real quick. But, it was worth the look and the noise.
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Missed my Cobra budget by thaaaat much.
Ya get that on big jobs.
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