BTW, K&N filters cause drivability problems. The oil gets on MAF sensor wires and insulates them, causing them to give false airflow readings.

There are also many studies that indicate that K&N air filters allow a lot more dirt to pass through than paper filters. Toyota makes about the best air filter out there, in my professional experience (I'm a licensed smog tech in Kalifornia and an ASE Master tech).

My best advise to anyone with a Mass AirFlow sensor (MAF) is to stick with the factory paper filter and stay as far away from K&N filters as humanly possible.