Yea I had read the changes for the rs. But it also has noticable changes in design. From memory and photos the regular focus and ST appear to share the same knuckle.I'll save you some time for at least ST vs RS
Also Ford's own marketing when the RS was unveiled mentioned the additional camber built into the knuckles to differentiate from the ST.Before we dive into the changes that our shop Focus ST has undergone, we first wanted to express that the use for the car has also changed. While we started with building a street car that was capable on track, it's slowly been adapted towards more track use. Going the more track-dedicated...damondmotorsports.com
So then it comes down to is there a difference between ST and regular Focus models. That's an unknown. I don't think there will be a difference personally.