Hey peeps, I’m looking at possibly purchasing a 2015 Yukon Denali XL. It has 130k miles on the clock. The seller told me that about 6k miles ago he replaced the cam, lifters, VLOM, etc. He went back with all stock parts and had a shop do the work. My question is why would someone choose to go back stock instead of deleting the DOD? I can’t understand going to that much expense and not getting rid of the problematic AFM system. Maybe there is something I don’t know. Help!