I have a 2005 6.0 powerstroke
has preloaded looney tunes on it but as well has a harness tapped into ECM. Harness leads to front of truck where it plugs into a box after unplugging the box and driving the tune goes away. But has no markings on the box and after research I can’t find anything that is made with the sct x4 tuner to act as a tune box. I’m very confused how this works and what it is for.
please help me out!