I got 51K miles out of my OEM CSC before I installed the Z1 CSC Elimination Kit. The original OEM CSC was still ok, but the master cylinder was starting fail yet again. I had already replaced the CMC twice by then, and I'm currently on my 5th one at 83K miles.
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2011 370Z 6MT Sport Gun Metallic | ARC | CJM | Ecutek | FI | Fujimura | R2C | SPL | Stillen | TWM | Z1 | ZSpeed | |