I have not seen anything that says billet wills increase the EGT, lots of hype about just about aftermarket part on the truck so I would take it all with a grain of salt. If you can get a balanced center section with new wheels that sounds good. I would get the locking bolts for the center section. Good time to do a regulated fuel return while the turbo is out. Take a good look at the pedestal while turbo is out.
1999 F350 AUTO 4x4 CC LB DRW 4.10