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maybe
not by restricting flow
but
possibly by taking the incoming air charge from an area of lower pressure,
like from behind a tire or from behind the car
the difference in pressure would be so small , the gains if any would be difficult to measure .
restricting flow can reduce maximum available power output but can not change FE Unless the system is carburated
2x as per the EPA (which never lies or fibs) and IATn which is more accurate and subject to a demand / need to prove test results .
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