go to cumminsforum.com or dieseltruck resource.com and start reading up on those trucks
one thing you can do right away is simply unplug the EGR valve.....you will get a check engine light but it will run fine and you are likely to pick up a couple of mpg
before you get into the EGR delete you will want to install a tuner and get rid of the DPF.....a straight pipe will go in place of the DPF
most liked tuners for those trucks are the Smarty or the Minimax.....
