Just a new guy lookn for info... I have a 05 5.3 4x4 black was my dd but not so much now. going to start the mods all ready have cold air long tubes from american racing on the way no cats with the magnaflow race muffler.... some time soon lookn for procharger d1 upgrade with 3 core intercooler and a 4l80E. but dont know what cams injectors who can tune around were i live at in Oolitic In witch is about 60 miles south of indy... what else can be done to these trucks.... Peace