Only issue is that PRL has said their catted DP throws check engine lights and they cant figure it out......I suspect all will throw light then.
Check engine sucks because the car will run rich to protect itself.
I think it more to do with how tight these cars are programed now. Also, from talking to handata, they don't do anything unless there is something to actually gain.
I can tell you it changes the code. Before reflash you will be running rich and have a lot of black soot out your exhaust. After the car will run perfectly.