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Back in 99 I got a new Lariat F-150. I had a buddy I was in the military with that had a speed shop after he retired. He used my truck to test various bolt on performance mods. The goal was to increase the torque in the 1500-5000 rpm range focusing more on the lower end.
We tried the two most popular intake system and a "stock-mod" air intake. The K&N and Air Raid were better than stock but a modified stock aibox with the baffle removed and a 80mm feed hose from the airbox to the fender did better than the aftermarket kits.
Regardless of the air intake system bumping the throttle body from 70mm to 75mm did more to help the torque than anything.
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Tony
NE ATL
'04 XLT regular cab 3.slo stepside
Semi retirement