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I hate to admit it but I have been running a K&N filter and after reading and re-reading the filter test http://www.duramax-diesel.com/spicer/index.htm I have finally decided to switch back.
I am wondering if anyone has used this Ford approaved Beefy Upgrade:
It is also not cheap. Most folks in FTE are running the less expensive 6637 filter, which is also much better than stock in terms of BOTH air flow end filtration efficiency.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.