On the F-150, the Gott's/Snorkel mod seems to work just as well as any commercial CAI kits. At least dyno results haven't indicated any appreciable difference. Not that there's really anything negative about the CAI so if you've got one already it's fine.
Newer trucks haven't seen any benefit to running a throttle body, but older trucks often see a moderate gain in mid to upper RPM performance in there area of about 5 to 8 HP.
Underdrive pulleys will require a small idle change (usually 50 RPM or so) to help keep the alternator charging correctly at idle.
In regards to air/fuel ratio and performance, peak torque and peak HP occur at different ratios with torque coming in about 11.25:1 to 11.6:1 and HP coming in around 12.25:1. If the fuel curves aren't correctly adjusted to meet the demands for the specific load/RPM, performance can suffer significantly.
I hope this makes sense.
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Bill Cohron - The Mad Doctor  
Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1997!
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