Since this is the place for the non-460 questions, Does anyone know anyhting about the 6.4L Powerstroke engines? My Father-in-Law's has been to the Ford dealerhip about 25 times now with poor run performance. He has the Edge Juice with Attitude chip and noticed, through the Edge's monitor, that it is running about 54 psi exhaust pressure with 20psi boost and it regens alot. I think the DPF filter is plugged, but Ford keeps replacing PRm's, ECM's, sensors, etc, etc. and will not touch or listen to him on the exhaust psi readings. If there are any diesel guys out there, what do you think? Am I on to something with the DPF filter? Thanks all!