K&N filters

I have the Banks ram air intake, its designed to allow more flow and not allowing the mass air sensor to get oil on it, a K&N by itself does nothing, you need a whole new air intake system to get the benefit.

Note the Banks uses a filter same as K&N but there intake has the filter housing sitting lower than mass air sensor.

http://assets.bankspower.com/prod_images/1027/ford_ramair_0607_68L.jpg