I bought the hemifever tune for my 2012 Durango R/T today.
I have a catback, intake and 180* thermostat. Previously best with those mods was 15.49@88
MPH. With the 87 canned tune and a trinity my best was 15.31@90
MPH. We'll see what the hemifever tune does.
I lost one or two MPH with the 87 canned tune from Diablosport but I had added 5% fuel due to some LT Knock I saw on the data logs.