Excuse me for asking a silly question but... what's the point of this mod? Since this doesn't improve maximum cooling capability, it can only govern engine coolant temperature under normal operating conditions. I assume it must be for more power somehow though I can't see how combustion conditions would change, just cylinder wall temperatures a very slight amount.
What's the downside to running the engine coolant at a lower temperature under normal operating conditions? Honda could have set the OEM thermostat setpoint to whatever they wanted, why would one think it is set too high?