Called SCT about this but I'm not sure if I understood his answer or he understood my question. Hopefully one of you can help. I'm running a 93 Octane Brenspeed tune and was checking out the user adjustable feature of the X3. I had no intention of changing anything - just wanted to see what options were available. I backed out of the screens with the cancel button. On one of the menus I thought I saw "can-save" which led me to believe I may have accidentally changed something to the tune. My question - If I did make a change and uploaded it to the PCM would it also permanently change the tune on the xcal? If I understood the guy from SCT, it wouldn't change the default tune but would add an option the next time I uploaded the tune and give me a choice of uploading the original tune or the tune with changes. Is that correct? The SCT manual is no help.