Unfortunately, the T airbox is ridged and thats gonna cause some difficulties. I have the deckplate which has been sitting on my workbench for over a month now. A 4-inch diameter will just fit, according to others who have done the install. Everyone talks about using gasket sealer to make it work but with the ridges I plan on using silicone caulk to fill in the ridges, and installing a screen on the inside to keep bugs out of the airbox.

96 T100 4x4 - 35's, 4" SL, 2" BL, 4.88s, ARBs, custom bumper & E9000 winch, etc.
99 F-350 4x4 superduty supercab turbodiesel longbed