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The 5.4L has alot more pulling power due to it's long stroke.
The best power gain will come from a Programmer, like a Diablosport Predator. A better muffler like a Flowmaster or Magnaflow and maybe a Air intake system like K&N.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.