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Those screens have no discernible effect on the airflow through the intake. Removing it may make you feel like you've done a free mod, but really, it had no effect on the engine that you will ever notice. Send it to me and I'll put it on my flow bench to prove it to you.
This type of screen also is not used as any kind of a "flow conditioner" for feeding into the MAF. Screens that serve that purpose need to have "depth" in the direction of flow like a honeycomb-type screen.
My only guess is that this screen was added to prevent large particles from being ingested by the intake. I agree, that it's impossible for something to make it that far into the intake if the rest of the system is intact, but there must have been some significant "what if?" scenario that Porsche saw fit to protect from.
Send me a PM and I'll send you my address. You can put it in an envelope and I'll bench test it.
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