Look at this post in the V8 and V6 Transmission forum- Poll: Project clutch master cylinder/second gear grind
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The 5th Gen's have a mastercylinder (not really a slave) under the clutch pedal. This member has modified it to provide more volume when depressed and it appears to alleviate the 1-2 shift grind.
Some people are also separating the reservoir for the hydraulics (brakes and clutch) to help keep the fluid cleaner, etc...
I just changed out the m/c and I'm really excited about the improved shifting!!