The masters seem to last a while, it's just recommended to replace both as there could be contaminants in the system leading to failure of one or the other. The master is not in the transmission, so you shouldn't have to drop the trans to swap it out.
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Competition Clutch|Fast Intentions|Maxbore|NST|Setrab|Stillen|Tomei|Uprev| Z1
Avant Garde|SPC|Stance|Whiteline
Aerojacket|Seibon|Tanabe|TRS|TWM
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