adding jakes to isx

[cowhater]

looking at 2004 9200i international with isx engine #79025530 cpl8287. Took this # to cummins dealer and they said engine was built without engine brakes. Is it possible to add jakes to this engine? I went to cummins parts online and see that it uses the same head, cam, and rockers as the integrated jake brake engines do (I used engine #79016667 cpl8287, it has jakes). I see they use different rocker shafts along with different exhaust bridges. I see used complete jake rocker arm shafts with all rockers and wiring harness anywhere from $700 to $1200 online. Would the ecm also have to be programmed? I would also have to add the cab switches. Anything else? thanks.