Question brought up by "Better size header"

[squid]

"Think of it this way,try breathing thru a small straw underwater,then go to a larger size,which one has less restriction?"
That doesnt make sense to me. Your trying to compare apples to oranges. If say for instance your mouth is 1 1/2" in diameter why would you compare a straw to a 1 1/2 header? To use your comparison you would start out with a 1 1/2" straw. If the ports on a 5.0 head were say 4" large I could understand your logic? But they are not.
And backpressure plays a big part in an efficient engine "velocity" . Why do you think tech articles report a loss in torque with a header primary that is too big for the combination?