I intend to install a high-flow cold air intake filter system in my truck. I've used K&N filters for years in my Harleys and other vehicles, but although K&N makes a replacement filter element for the stock filter, they don't make the type of unit I'm looking for. Instead I'm considering an aFe Power stage 1 intake system designed specifically for the 2012 EcoBoost engine.
For reference, it's part number 75-12111 at afepower.com
The device replaces some of the stock ducting and offers a choice of three filter elements, a 3-layer dry filter, and either a 5- or 7-layer oiled filter.
Obviously, the more layers of oiled filter media means more protection for the engine. But at what cost? The more media to scrub the air, the less the air flow through the filter. The whole reason for installing a "high-flow" filter in the first place is to increase the efficiency of the engine. That is, more power at a given fuel flow.
So, my question is, which filter should I choose to balance protection and efficiency when using the truck for normal or average driving conditions?