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For what its worth, I have had my jb4 with the iso update and catless downpipe for a few months and I was experiencing the same problems with rough idle and the car stalling.
I had to take the jb4 off the car and remove the catless downpipe in order to pass my inspection here in New York and I also got my service done a few days later.
During the two weeks that I had the car completely stock, other than an intercooler and chargepipe, I experienced no rough idle and the car did not die on me once. I reinstalled the jb4 and catless downpipe this past saturday and have since been experiencing rough idle and the car has died on me twice already while driving. I have had no codes thrown and my service advisor told me everything was okay with the car before I reinstalled the jb4 and downpipe.
I am not blaming or bashing BMS for their tune or Berk for their downpipe, I am only sharing my experiences. I also would like this issue to be resolved.
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