Not sure if was the ficm tune or both but its crazy as hell now. I put in on performance and 80hp on the ficm.
Get some GH custom tunes makes a huge difference on how the truck runs. You will be even more happy LOL.
I ordered gearhead tunes for a buddies 6.oh truck has more power better trans shifting and overall runs better and also cooler then the SCT canned stuff.
Put the truck on SRL+
We then ordered a IDP FICM tuner
Put the ficm tuner on performance and now it flat out runs for a "stockish" 6.0 on 8 inch lift with 38's.
Truck got normal stuff CAI exhaust and tunes.
Truck runs Gearhead SRL+ with IDP performance ficm tune daily for the past 7K miles no problems yet.