I have an '05 Legacy GT, with 67,000 miles on it. In order to eliminate the "drag" on the shifter, I must push the clutch pedal all the way to the floor. It acts like a worn-out clutch, but there is no slippage or chatter from the clutch. Is there an adjustment on the slave cylinder? I can't see the slave cylinder because the intercooler is in the way.

They have a hydarulic clutch so its automatically adjusted...you could try bleeding it and see if that helps...