If it could be seen, my dealer would have found itcby now.
TS Performance website also list it as undetectable. It's not a downloader, simply intercepts the injector pulse from the ECU, alters its intensity and duration and sends the modified signal to the injector solenoid. There is nothing reporting back to the ECU like a pressure box.
My truck has been to the dealer so many times I've lost count,( not for engine related issues) and they have never found anything.