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Also how do you know that those using the S5 trans on their cars are not using the S4 clutch components including the fork? The transmission may not be an issue but the components of the clutch can be. :-)
As of 8/16/2010 I know first hand that you can use a S5 trans with an S5 fork and get proper clutch action.
I mean to say, S5 trans w/S5 fork on S4 clutch components. It does not look like you can swap the forks, the geometry of the forks is slightly different.