I'm not running the SZ high 5 clutch but I do have a faint wine sound coming from my transmission area as well. It goes away as soon as I put a small bit of pressure on the clutch pedal. It usually only does this after the car is cold and goes away once warm.
I didn't investigate it much but I could be from the UR aluminum pulleys I was running. I'm not entirely sure but it never bothered me to the point of digging in.