a smaller torque and smaller HP ranges hence a need for additional pucks (2 in this case) wouldn't be needed. Of course the Civic puck clutch has a large surface coverage per puck as to the Z 6 puck. The 6 puck Z clutch has 2 pucks with smaller availability of surface coverage but the displacement of heat transfer and grip coverage is supposedly better for our HP and Torque configurations. It comes down to needs for the machine. You wouldn't want a 4 puck in a Z pumping out loads of torqe and HP with a 4 puck with less than promising grip properties, hence breaking up the 4 into a 6 configuration.
That's just what I heard. Is that enough of a BS answer for ya.