IMO (that means in my *opinion*) K&N air filters are junk. They don't filter worth a crap, and allow tons of particulates into the engine. Very bad thing if you have a turbo. Also, if you have a MAF, the filter oil will ruin it in very short order. They cost a lot more than OEM paper filter. They're more of a PITA (labor to clean vs. throw-out-and-replace). And they provide zero tangible benefit to the user.

Wanna pay more money, for more aggravation, and less quality? Buy a K&N!

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'98 E300 turbodiesel