2009 ISX 15

[mxmom777]

Pay attention to rawze instructions and videos. I ran into similar problems I pull heavy. B train. 100k pay load. 140k gross. He as well as my wife have by far been the most help to me. Saving me thousands of dollars by doing more myself. If your commmimh from a pre Emmisions to the 871 there is a huge lag between pre emission response and the 871. But once you get them dialed in that’s a different story.

I wondering what your dpf state is like. That will cause a huge delay in getting the exhaust out