The only replacement that FORD is going to consider correct is for you to go back to the stock airbox and a paper filter. There is no paper filter on any air intake kit that Ford is going to consider correct. Generally, the manufacturers don't condone replacing the airbox and its paper filter with ANY after-market air intake kit, no mater what the kit's cone filter is made of. And a lot of dealers will try to tell you that the kit, or a part of the kit, such as the filter, caused this or that warranty-voiding problem, even tho usually it didn't.
Bright Red 2003 Edge Plus, 3.0 liter, reg. cab, 4WD, manual trans., 4.10 rear end.
Mods: Speedliner spray-on bed liner. Air box mod. K&N drop in air filter. Gibson Sweptside single pipe catback system. James Duff traction bars (above the springs type). Delta Industries black polyethelene truck box (mounted on the driver's side of the pickup box between wheel well and cab). Hidden Hitch receiver hitch. Side window visors. Door pockets.