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Back Pressure Bunk

Back pressure doesn't help in any way shape or form. Proper gas velocity, OTOH, does. That's why Honda's VTEC only opens two of four valves at low RPM's, smaller opening means gas flows faster and produces better low end torque. As RPM's go up, all four valves open so you don't get too restrictive.

Back pressure. Sheesh.
 
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