FWIW, I have heard specifically of the o-rings deteriorating in the crapshimoto thermostats. Not worth risking your motor IMO. There are other brand options.
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2011 370Z 6MT Sport Gun Metallic | ARC | CJM | Ecutek | FI | Fujimura | R2C | SPL | Stillen | TWM | Z1 | ZSpeed | |