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5 is better than 4. There may be machine work, swapping parts and/or thinner clutches/plates to fit more than OEM. I've always heard that the red clutches are the best, but forgot the brand name.

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Yes I'm running the thinner discs so I can fit the 5. I have .070 clearance, I believe that is optimal

The clutches I took out are red with deep grooves in them. They are the same color as my race discs from CRT, but the CRT discs have a lighter groove in them....