Well, on the 05+, the exhaust is very efficiant from the headers back stock. It's not so much that some back pressure is needed, is just Ford made it efficiant and right the first time. So exhaust wise, all you need is headers and a matching mid-pipe. Mufflers only provide a difference in sound, unless you are pushing extreme power. CAI does provide increases, but mainly combined w/ a tune. Throttle bodies really don't. Gears are great but gotta not fear it and go high.
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