high egt

About 2 weeks ago my 08's egt's went through the roof. I'm seein 800-1300 while driving. 350 to 400 or so at idle. dealer says everything is ok but i know its not. burnin lots of fuel. seems like its been in rejen but hotter. 08 chevy 2500. banks intake, exaust, 6gun on 2 or 3, air dog with lift...

ok fellas my buddy has a lmm with efi and dpf delete hes been running it for 3 days he has dsp 5 highest tune is around 120 it does have the dpf delete , BUT the dpf is still on there no it doesnt want to go over 2k rpms and then evenually died out is it the dpf we are gunna remove it...