If your current clutch fluid is black or really dark then I wouldn't install the new master without doing a new slave.
No point in installing a new master to have it deal with contaminated brake fluid and wear the seals out.
Leave it alone until you're ready to do a clutch & flywheel, of which I would highly recommend ZSpeed. I love my stage 3.
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2010 Sport - LS3 swap loading
2012 Frontier - BTWTuning VK56DE swap
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