If you read their ads closely, they will claim a lot of things (mostly unmeasurable things, or irrelevant things, like how much more they can *theoretically* flow), but they won't claim they filter better than stock paper filters.
Its because they don't and they don't want to get busted for false advertising.
So, basically, on a Porsche, using a K&N gets you decreased filtering in exchange for no performance gain. Not a good trade-off.
(Sure, they are reusable, but how much money are you going to spend on factory OE paper air filters during the life of your car??)
Again, another one of those "mods" that people do without really *knowing* why they tossing a factory part, on the *presumption* that the factory part is somehow inferior. All based on self-serving and misleading advertising.
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