The SCT line of products is the most commonly used and best supported tuner for Fords. You can go to their website and enter your ZIP to find the dealer/tuning shop nearest you.
DiabloSport is another option, but seems to be a bit less popular.
Really, the handheld tuner is just a storage device, and the brand you choose isn't critical. What is important is the tune or file that is stored in the tuner. Make sure that you're getting a tune that is custom written for you and your needs instead of a generic ' one size fits all' or canned tune. Expect to spend $400-$500.
DiabloSport is another option, but seems to be a bit less popular.
Really, the handheld tuner is just a storage device, and the brand you choose isn't critical. What is important is the tune or file that is stored in the tuner. Make sure that you're getting a tune that is custom written for you and your needs instead of a generic ' one size fits all' or canned tune. Expect to spend $400-$500.