From what I can tell most pickups with diesel engines do not come with exhaust brakes on them, except, I believe, for the latest iteration of the 6.7 Cummins. For those of you who have diesels, do ...
For folks with experience using a 7.3 exhaust brake, brakes for this engine must use very low backpressure to keep the lifter seated. This low pressure means low braking power, and isn't a good example of modern exhaust brakes.