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asphaltgambler asphaltgambler is offline
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Join Date: Nov 2004
Location: Nokesville, Va.
Posts: 5,255
I have seen aftermarket (American) intake manifolds with air dams / foils in the runners and the plenum. Somewhat like fish scales. Smooth one way but with slight edges to disturb airflow reversion.

Also exhaust headers with 'cones' at the leading edge of the tube where the flange meets the exhaust port. The cones small end points inwards inside a double-walled header pipe. Reversion is halted because the 'cone' traps the reversing airflow
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Old 08-09-2005, 06:31 PM
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