That is a sharp truck!I had 2008 6.4 and never had an issue with it. 125k miles when I sold it. Did the EGR delete and a couple of other mods.
I had custom tuned. It was a beast. I seen near 58 psi boost during one run. The sequential turbo's had very little lag.
Fuel economy wasn't that great, but none were back than. It ran a best of 0-60 in 4.6 seconds. 4 wheel drive launch. It ate many muscle cars if they even squeaked a tire on launch.
It was a reliable truck for me.