I appreciate all the input. I will either go with the Fl 820 or the K&N HP 2011. The K&N is easier to find. Have not used the K&N before as I have usually used the Amsoil or Mobil 1 or Pure One in my other vehicles. The availability of filters for the 5.0 is not abundant. This is my first Ford since my '66 Mustang many years ago..
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