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Headers and free flowing exhaust will help power and milage to the tune of about 10%. Be carefull with the K&N filter, if not well oiled and cleaned frequently all the dirt goes straight to the cylinder walls and really hurts the engine.
Gibson makes a catback exhaust that added about 11 hp to my truck and a small increase in mpg. (plus it sounds wicked awesome). msd makes an ignition too that will help out, also new wires/plugs. Just be careful to get the right type of plugs b/c if they run too hot they can weld themselves to your engine( not a good thing). Motorhaven has chips available too.
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.