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I'm not sure if It really helps or not; I'm sure someone will jump in here, but I read about it first in TPIS catalog and they claim It does. Cut out my screens and vanes 2 yrs ago, with no problems.
The purpose of the screens is to straighten the turbulent airflow coming from the airfilter. It does reduce CFM, but if your engine needs the extra airflow, then it would be beneficial to remove the screens.
The vains are a heat sink for the electronics inside the MAF sensor. Again, if your engine needs the additional airlfow, your should cut them down.