I have a 1996 Mustang GT and I have an SCT tuner. I am running the 91 octane tune on mine and My Mustang is an automatic and the tune switched my shift points. Now my Mustang shifts way better and runs stronger. It runs great and I got the Tune from American Muscle.
1996 Mustang GT (Sold to my brother to keep it in the Family)
2004 Mustang Mach 1