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...just as there's an optimum gas velocity (~300 fps) in headers for making HP, there's gonna be some minimum gas velocity (??? fps) in headers for making FE.
...in the first place (HP), the velocity has to be high enough to get out of the pipe with minimum slowdown...while in the second place (FE), the velocity needs to be just fast enough to get out of the pipe without impeding the 'next' cylinder's discharge.
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