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I'll quote a section from iwantaporsche.net in here:
"Let me urge you NOT to replace it (air filter) with a K&N or any other brand of aftermarket filter that requires you to spray oil on the filter to trap out dirt. This oil will get very, very hot and thins out by nature. During hard driving (which I hope you plan to do!) a thin mist of oil is brought through the filter and into the engine’s intake.
This is not all that bad from what I have learned, but what is horrible is that a mist of hot oil can come into contact with your mass air fuel (MAF) sensor and foul it out. When this happens, your Porsche will run like crap, get lousy fuel economy, and you will learn a very expensive lesson. MAF sensors are expensive to replace… $400 online and far more at the dealership’s parts counter.
So, resist the temptation to gain a few HP by “upgrading” your air filter. Use a stock air filter and sleep at night knowing you will not have fouled out an expensive sensor."
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