A box K&N replacement is actually better than adding a conical filter to the end of the stock hose. The reason is because the air from the fenderwell is colder and denser than the air out of the engine compartment. Make sure there are no cracks or anything in your airbox if you decide to go this route. The box style filter costs about $40 to $50.
As for headers, I would go with equal lenghts. Just about any brand will work. It depends on what you want to spend.
FYI, you can buy an off road h pipe for about $100 plus shipping.
No cats and an aftermarket exhaust will give you excellent sound, if you like the rumbling sound of a V8.
A real boost on any 5.0 is putting in a set of gears. Since you want the best gas mileage you can get, I would reccomend the 3.55s. You can really feel the difference!
Hope this helps you out.
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