If, by chance you can get an increase in pressure, then forcing more air in to the engine will have the affect of increasing the amount of gasoline that is needed as well, otherwise the throttle plate will have to close further, creating turbulence inside of the intake making the engine work harder.
It all depends on what your goal is and if the fraction of a psi of pressure you could get, less then 1/10th of a PSI, is worth the extra ducting that you would have to install
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