hi there, I have a 2003 cobra, I didn’t know if it had a tune or not before, i plugged in my SCT and there was nothing under custom tunes but did have “mustang cobra” labeled on the options it was tuned to 93 octane, I changed it to 91 & turned my rear o2 sensors off. I also had a idle surge issue and it said there’s a driving idle and neutral idle, what are you guys set at? Would this be a custom tune or em I just changing factory settings?