Jesus...that was a long read, but Dom, I think he is in fact agreeing with your statement that backpressure is not needed. What he is saying is that the velocity needs to be higher, more so than the backpressure needs to be low. He's giving a different perspective on backpressure and header primary/ collector sizes.
Think of it in terms of intake manifolds...smaller, longer ports create higher velocity for more low rpm torque, where as larger, shorter, stack type ports give you high RPM HP. Am I following you correctly Mike?
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