Wouldn't the velocity of the exhaust stay the same in the header?? Because you are not changing you header to a bigger one, wouldn't the velocity of the exhaust just slow down when it gets into the bigger test pipe. I don't see how exhaust could possibly stay in the header, if it stayed there would be no room for the upcoming exhaust to come in and would creat back pressure. I don't know too much, but this whole thing doesn't make sense to me at all, logically that is. Please correct me if I'm wrong so I can understand this.
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