WHen I added my hydraulic system I designed it to be the same leverage as the existing zbar system. It made absolutely no difference in pedal pressure. SO, the hydraulic system in and of itself did nothing to lighten the pedal. Exactly the same. I went down in the master size and it helped pedal pressure a little but its still a healthy push with a Spec Stage 1 clutch and about the same as every other clutch I have run on this car. I drove a Boss 302 with a Centerforce and about shoved the pedal through the floorboards it was so easy. If they werent so heavy and expensive, I would go that route.I have to ask what the point of a hydraulic clutch booster would be? As an example, the hydraulic clutch in my beater(2005 Mazda 6) is already so light that when I am bleeding the clutch I actually just use my hand to pump the pedal rather than a foot. I guess that various clutches are going to be varying weights, depending on the bore, but still...I would like a least some amount of pedal resistance.
I might be able to get one of these assist units cheap and thought I would try it...