With the 6.0 I would absolutely think about opening up the intake and exhaust as basic mods even with your current programmer setup. if you don't have a diesel emissions requirement where you live...
the better the engine can breathe the cooler your EGT's will be and the better off the whole truck will be
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DJ Phoenix (my modded) Hi-1200/240Tow/75FS/80DD/100/140SS +Minotaur
ASE Master Auto Technician 
2001 Ford Excursion 7.3 4x4
Projects. 1970's Hustler and Max II Amphibious ATV's
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