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I'm researching this question right now as I too am trying to decide on an Airaid. K&N has a good article on their site talking about the differences. Performance wise, you said it, oiled provides more air flow but not at the detriment of filtration. The oil allows for different material and construction and through the added layer construction, it can actually hold more dirt. The dry filter allows air flow and filtration with microscopic holes. When these holes get blocked, they affect performance but typically you just have to clean it out more often.

My thought right now is oiled. Better air flow.
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