My bought new jeep had an exhaust burn off issue from the get go.....take it into dealer and they 'burn off' the buildup in the DPF .....now that its off warranty they want insane money to do that. My independant mechanic has shown me the carbon buildup from the EGR tube and into the intake manifold.....its unbelievable....diesel intakes were not designed to burn off secondary exhaust and all the extra plumbing they put on this engine simply does not work. So people do diesel delete and in fact the chrysler dealer told me, on the qt, to do just that. Chrysler needs its feet held to the fire over these engines and i see a recall over coolant backing up into the engine which is related to this carbon buildup problem. Would appreciate any comments if you have had similar experiences.