I am NOT a believer.
Some dilligent checking on the Ford Parts web site reveals that with the exception of one or two compnents on the EcoBoost engines, all Ford F150s breathe through the same intake components regardless of displacement. The snorkel, airbox, airbox lid, air filter, intake hose, and intake resonator are all the same part numbers from the V6 engines to the 6.2L. That's right, your high performance, heavy breathing 411 bhp 6.2L breathes through the same intake components as the 302 bhp 3.7L V6.
This parts commonality is great for Ford and may be fine if you own a 3.7L V6, but I have to be skeptical that the intake components for an average sized V6 are optimum for a large, high performance V8.