2000 magnum

I think I'm going to put some headers on it and maybe advance the camshaft 4-8degrees and get a programmer for it see if I can't make it a bit better on the mileage end of things if it got double the mileage I was now I would be ok with considering it is a work truck and only driven 4-6 months of the year it has 265/85-17 rubber on it and 3:73 ratio don't want to give up on it because of mileage the rest of the truck is sounds