Re: any K&N user here...
I haven't had any issues with a K&N filter. Been using for about a year.
2005 Ford Explorer XLT 4.0
2003 Ranger Regular Cab 7FT Bed XLT 3.0 (SOLD)
Mods: Throttle Cable, Air Silencer Removal, 06+ Badges, Tails, and Corners