The 04-08 F150s with the 4.6 engine have a different intake and filter arrangement. It also has a snorkel tip that goes into the fender hole so it can be removed and replaced with a straight pipe similar to the DWV intake mod for the 5.4L engine. I think there is also a silencer insert in the intake tube downstream of the filter housing that some folks have removed to improve flow and add a ponies.
EDIT to add: It looks like the 08 pictured above has a different style intake than the 05 with the 4.6 that I looked at regarding the silencer removal. See the link below:
http://www.f150online.com/forums/1821762-post13.html
Wed, February 11th, 2009, 05:33 PM
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