The aforementioned autospeed article
Don't Bother Changing the Factory Filter
Quote:
To put it as simply as possible, there’s no problem with the flow of the factory filter – even when it’s dirty.
And we’ve seen the same story on everything from an Audi S4 to a Subaru Liberty RS to a Nissan Maxima V6 Turbo to a Commodore VL Turbo to a....
In nearly all cases it’s not the factory filter element which is causing the restriction. Instead, it’s likely to be the snorkel going into the airbox, or even the shape of the airbox itself.
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Which is why I don't bother changing my old air filter.... It's flowing fine and lab testing shows its filtering