I have a Subaru STI 2009 with 180k kilometers on it a very hard clutch, closer to a truck than a usual car. It works fine and has been that way for at least the two years I've had the car but it is so hard that I wore through two master cylinders within the last year and if I remember correctly the Western Star 4900 I tried last year had a slightly softer clutch.
I also tried another, more recent, STI and the clutch was hard for a normal car but nothing like mine.
Now after watching a few clutch videos I wonder if simply opening up the clutch and greasing the throwout bearing axle and other sliding parts could solve, or at least help with my issue?
There is no rattling noise when I use the clutch, and it works great apart from the fact that is is pretty much impossible to do a clean start without any vibration. It feels somewhere in between that other STI clutch I've tried and a race clutch I tried a few years back on a Jetta VR6. The race clutch had more vibration but was softer than my clutch.
A possibility would be that a previous owner modified the pressure plate for a heavier one but I don't know how I could verify that other than opening it up.