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is the mini installed? is it one of the older units that allows dpf delete tuning?
yes the newer updates from Ford do not tell you when you're in regen - i may be mistaken but mine only told me when it was beginning/finishing. so you only notice the regen at highway speeds? depending on your driving habits it may ONLY regen on the highway. if you do enough highway the truck will know this and just save the regen for a time when you're going fast enough to create the necessary exhaust gas temperatures to burn all the nonsense out of the DPF.
do you still have a warranty?
i wouldn't ditch the warranty before i was 100% sure, or as close to it as possible, about the truck's health. so go talk to a mechanic - but continue to get background info cause no one wants to explain the basics.
Y pipes are cab off at the dealership so i would confirm they're all good. if you don't have time to befriend a diesel tech there are three ways to diag. Y pipes; get a flashlight and LOOK for signs of soot on the back of the motor and on the pipes; LISTEN for atypical rushing air (stupid difficult seeing as we've got two turbos); FEEL for a lack of power/lower boost
get a flashlight and look for evidence of soot on the actual pipes and surrounding area. you could also try listening a rushing air type of noise (stupid difficult to pick out IMO)