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some more about header wrapping and its benefit to exhaust gas velocity from srcinc.net:
Wrapping the headers also serves two other important functions. Low rpm engine performance will be increased due to the higher exhaust gas velocity. This is due to the fact that cooler exhaust gas temperature result in a smaller exhaust gas volume and resultant lower exhaust gas velocity at any given engine rpm. Because both intake and exhaust valves are open at the beginning of the intake stroke, exhaust gas reversal can occur at lower rpms thereby reducing engine performance.
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