Originally Posted by old1030
I think you are correct about the ST170. I remember reading on the Mustang forum that the "ST" stood for Sports Technologies and the 170 was the HP. The same HP found in the SVT here.
The ZX3 doesn't necessarily mean an upgraded 3 door Focus. It's just the designation for the 3 door hatch. Within the ZX3 and ZX5 hatch models from '05 on there were "S", "SE", and "SES" trims. SES as you know was the top trim until the Titanium models came along in '12.
Roger that, I knew I couldn't be correct on all of that with my little bitty brain at this hour:) Alas, I have learned something but will probably not remember it by morning.