People are hard pressed to get any of the clutch system replaced under warranty. I still feel that of all the people here with manuals, a total for 3 people (Jarblue, Alstann, and tibal) with a total of 5 MC failures between them is hardly enough to make it a failure prone part. The vast majority of people replacing the MC isn't because of failure but because it's relatively cheap to replace when your doing a clutch job and a handful that have failed are posted all over that they fail.

A reading from the holy book of manhood according to FalconFixer.

Sorry... I had to quote this comment because of how epic it is. Carry on.

You act like those are the only three people who've ever had a master fail on their 370Z. I'm guessing a lot of people don't post about a failed master because it isn't a big deal. The CSC is a much bigger issue as it costs significantly more to fix.

The CMC may not be as prone to failure as the CSC, but it is still part of a poorly designed system leading to higher failure rates. If the CSC fails, the closed hydraulic clutch system becomes compromised. Dirt gets in the clutch fluid and that dirt can subsequently affect the what may have previously been perfectly good seals in the CMC. But now that dirt has compromised those seals as well, so you are looking as CMC failure in the near future most likely. This is why you should replace both. Not because the shop is trying to make money off you.

Just ask resident expert Joe at ZSpeed whether he thinks the master should be replaced whenever the slave is replaced. Or if you know best, try it out for yourself and let us know how not changing out the master with the slave works out for you.

Call me a little 'OCD', but every car I've ever had with a MT, when I replaced the clutch and associated hardware, I also replaced the slave & master cylinders, along with the rubber hose (if it had one). It's just a good idea... :)