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I'll try and answer to the best of my abilities...
You really only need a 4 incher unless you are making big power, but I don't think it will hurt.
Every body on this site seem to swear by the SCT for the 6.0 with some custom tunes.
And I'm sure someone will tell you this, so I will just say it. The stock filter is really good and flows alot better than most stock filters, so it SHOULD be sufficient.
Have fun with your new truck!
07 Red F-250 CC SB PowerStrokeDiesel
4 inch MBRP turbo back....no muffler, no cat
33 inch Pro Comp All Terrains
Texas Ranger CB Radio