I wouldn't be worried in the least about buying a truck with 150k miles on it. Why anyone would need to add a tunner to a new truck is beyond my comprehension. I can see using a tunner to delete emission codes for a delete. The 7.3 and 6.0 need to be tuned to pull and pass but all the newer diesel trucks have plenty of power. IMO

Last edited by TrueGrit; 06/18/20.
Life is good live it while you can.