Just a small update.
For the 4.7L, the throttle body attachment OD is 3.25", not 3.5". The air filter housing is still 3.5" OD.
I've got a 45 degree PVC "street" elbow and coupling for the air filter end, a 90 degree PVC "street" elbow for the throttle body end, and a short piece of 3" schedule 40 PVC to go between the two. I've ordered the foil/fiberglass insulation, a 3.5" to 3.25" reducing coupling for the throttle body attachment and a rubber grommet for the IAT sensor. Those should be in later this week, but I won't get to it until next week.
I'm going on vacation (my plans) until August 1st or 2nd. I might post up a "How to" post with pictures here (or maybe on another Jeep XK/WK related forum, that's another can of worms) when I get back.
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I'm not arguing, I'm just explaining why I'm correct.