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...and headers are designed the same way that tuned exhausts are...
Furthermore, if you can show me a stock manifold that will provide back pressure when run to open atmosphere, I'll send a quarter to you in the mail.
Fluid dynamics is not nearly as cut and dry as that.
The way you posted that, it makes it seem like you're saying that if a manifold can't provide scavenging, it is providing back pressure, which is simply not true.
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