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I bought a factory filter and the tubes to put on my 04 f250. mine came with an airaid that i have heard aren't as good as oem. i got it on Craigslist for $75 and it came with a new filter. it came off of an 06 f250.
only thing i cant figure is where the secondary intake hose mounts? i looked at a photo of an 03 intake and i didn't see the secondary hose on the dirty air side. is this just left loose near the battery? i assume its so that the engine wont completely starve if a walmart bag goes through the primary pickup.
From all that I have read on three forums, the stock intake is best, unless you are going for real big HP. There are a few members that push a little over 500 HP with stock filter and intake.