All of them.
You know, when I was driving Mustangs, it was fun to tweak them for a little more power and put good, aftermarket suspension and stuff on them. I think I had more fun just doing these mods and witnessing the results. I never consider doing the same with the Ex save for a few minor things. It's the 'family truckster' in my mind. Purpose built more for it's utility rather than sport. I don't care about how fast it is 0-60 or quarter mile times. When it comes to power, I only care that it can get out of it's own way and it does this well as is. IMO, if you want fast, get a purpose built car. Mustangs are still reasonable for this and still more bang for the buck as I see it and you don't have to be the fastest guy on the road to have fun with them. At least, I never cared about that. It was just a fun experience.