The SCT  X4 is THE tuner for your diesel. Along with the standard SCT tunes, you get 3 Customized tunes for your 7.3 and 6.0. 
 
Here are the 6.0 custom tunes we offer:
Xtreme X - 440rwhp/780rwtq - All out power tune!
Xtreme Race- 425rwhp/760rwtq - Converter locked in all gears.
Xtreme Street- 415rwhp/730rwtq- Not recommended for towing.
Aggressive Street - 400rwhp/700rtwq.
Street- 380rwhp/650rwtq- Tow up to 10k lbs.
Tow- 310rwhp/560rwtq- Towing over 10k lbs up to the maximum of the truck.
Economy- 340rwhp/620rwtq. Used for mileage and light towing under 10k lbs