Originally Posted by hamsmotorsports
Egr delete. Check oil vs coolant temp maybe a oil cooler depending on if your temps are off. coolant filter. And if newer than 05 stc fitting update. Egr delete. Tuner. Egr delete.
What he said...
Unless you want to add another zero to your budget i wouldn't even consider it a budget. i also wouldn't bother messing around with much performance stuff, that 6.0 will swallow that thousand bucks in one hiccup.
Other than what he said i would get an electronic gauge (insight or scangauge), exhaust and then check fuel pressure, batteries, ficm etc. and make sure you have enough money to keep up on your preventative maintenance.