@gilscales So..you are in CA. That's an issue. The emissions control on the 6.4 is the suck. My is literally bypassed entirely. Gone. Deleted.
That's the secret to a 6.4. Be very careful when it is burning particulates, keep it clean. Spend the extra dollars getting that portion of the system checked. SPEND THE DOLLARS. Otherwise it will bomb.
Mine has less than 1 year left as a sort of gray market truck then on to being a Farm Plated truck and the emissions don't matter (no inspections). It purrs for now, pulled a 12k lb payload 150 miles each way last week, had it on a very heavy gooseneck, sure was afraid I was overweight. The truck pulled it ok, not fast. I'm very easy on the turbo when it is cool. I let the truck warm up as much as I can and don't hammer the accelerator in the first 10-20 mins, just take it easy. Man, the torque from 50-80mph is just fun so that can be hard to contain.
Things to watch out for is the front suspension-ball joints, hubs, etc. Get that inspected twice a year. Safe for you and everyone else.
I've had no major repairs. Not a one. Brakes, calipers, ball joints, hubs, all normal but no engine or transmission issues.