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No offense to Mr. Dinan, but he is way oversimplifying the matter. Too big a post header exhaust can indeed hurt low end power, as the energy in the exhaust stream is lost to thermal cooling due to an overly large "column of air" found in too large a tube. We have documented this time and again with our chassis dyno.
Also, cylinder scavenging effects can be lost with a mismatched header and cat-back system on a normally aspirated engine. A header can be tuned with a certain backpressure found in the "cat back" or "header back" portion of the exhaust. Going too big or small with that secondary exhaust portion can disrupt the tuned-in scavenging abilities of the overall system, resulting in a loss of power.
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