excessive torque steer is down to worn front bushes from what i've read on here so upgrading to poly is a good idea.
rust wise same as any other focus, check bottom of doors, undernieth where wing mirror attaches and bottom of boot window as water collects there. undernieth, the front and rear subframes rust, especially on the rear by the exhaust but it shold only be surface rust on an rs. my focus is 10 years old and its only surface rust!
other than that i think they are excelent track day cars