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If you increase the airflow through the same area, you are somehow letting more air through with less restriction/filtration. Less filtration means more dirt in the engine, more wear on those parts that scrape together. Every independent study I've read says oiled filters let more dirt and bigger dirt through by significant amounts. And a person I respect did dyno tests and said the air filter the Boxster comes with is good enough to not cause a lack of performance until the motor puts out more than 350 HP.
Could a neglected filter collect enough dirt that it restricted airflow enough to make a HP difference, sure. But replacing with a clean OEM filter would have freed up the airflow just fine.
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