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Installing headers on these trucks is a pretty common mod and a lot of times you will need to have an exhaust shop weld the EGR fitting and o2 bungs on for you in the correct places.
Lots of options for headers with A.I.R system already in place.
I suggest you use your favorite parts stores online site. Most allow you to specify your make, model, and drive train and will show you many options.
Spend the extra money for quality stuff and you'll be less likely to suffer exhaust leaks later.