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aren't most flow benchs reverse flowed (ie, Vacuumed)? Ie; air is pulled through the exhaust, into the head, which is totally opposite to the direction of exhaust flow. Also, if you look at the flow bench results, the longest runner (#1 and #2 ports) always outflow the rest, as the air has time to gather and become uniform, unlike #3, #4, #5 and #6.
Petz #3
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