Id say 4" turbo back MBRP,AFE are both good exhausts and install nicely\
muffler or not is up to you.. I prefer NO Muff
Id go with a TS 6 Position chip over a programmer for the 7.3
If ya need me to I can get you set up with what you want.
Dont forget gauges and an air filter AFE drop ins are great. Id stay clear or the K&N theyve been known to let dirt get past (not good for the turbo)
Ig ya got anymore ??'s just ask.. BYE NOW,.. John