6.7L Exhuast Upgrade
#11
People will tell you that there programmer cannot be detected but once you take the truck in many times the technicians will check the computer and it isnt to hard for them to tell that you have messed with the computer even if you return it to the factory default settings before you take it in.
#12
#13
I would ask at what mileage was the last oil change & fuel filters were changed
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