that's a big plus right there. I would look into a tuner. That will give you most bang for the buck. Exhaust will give you a few horsepower, but not anything you will really notice. Maybe in conjunction with a tuner it might make a difference. I traded my 6.0 truck for a diesel last summer. I only tow maybe 2000 miles a year, but don't regret it at all. The power difference it unbelievable. The torque is exactly double, and it feels like it. Fuel economy much better too.
David & Lynn
2014 Coachmen Chaparral Signature 327 RLKS
2016 Ford F350 Lariat CC Dually