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Originally Posted by Goat Blower
but since the turbo makes positive pressure, it's technically not a restriction.
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Huh? The entire exhaust "track" of an automobile, whether it is turbocharged or not, is one big pressure differential. It is that pressure differential which causes the exhaust to flow because of your tailpipe being at atmospheric pressure and the exhaust exiting through your exhaust valves is at a much higher pressure. Since gases flow from high pressure to lower pressure, that's why automobile exhaust flows the way it does.
I wish I had a better handle on my fluid dynamics because I do not believe the crude calculations associated with the original question in this thread to be very complex.