2007 plate cars had a slightly different clutch from the earlier ones. Story goes Ford put a better clutch in the earlier cars but customers complained of a heavy clutch. They changed the clutch in 2007 along with a slightly different intercooler, some interior tweaks (different colour illumination, different shape head unit) and also fitted black headlights rather than the chrome style ones (few other small tweaks as well as these but not major).

The clutch fitted to 57 onwards are different again. As for standard replacements - I would imagine it would be of the later cars type.

Personally - if you tune the ST chances are eventually you will need to upgrade the clutch - no different to tuning other cars.

Rob