Originally Posted by dagren99

Cat or no cat depends on where (which factory) the truck was built in and where it was intended for initial sale. This went away at thethe 6.0 launch as they all got cats to meet the new epa stds. Kentucky built trucks = no cat
Trucks destined for MA or CA got gpcms and cats but those weren't built in KY as far as I can tell. Never seen a KY truck w either. Can't recall where the other SD plant is.