Racing Thermostat

• 2006-2011 Honda | Civic Si

The Mishimoto Racing Thermostat is a direct-fit racing thermostat for the 2006-2011 Honda Civic Si that promotes greater cooling efficiency throughout the engine. It significantly lowers the high engine temperatures produced by modified and upgraded turbo applications, opening at a lower temperature (62 degrees C) than standard Civic Si thermostats once the engine is fully warmed up, so coolant flows through the engine sooner and cooler engine temperatures are reduced and maintained.

• Direct fit for the 2006-2011 Honda Civic Si
• Promotes greater cooling efficiency throughout the engine
• Significantly lowers high engine temperatures produced by modified and upgraded turbo applications
• Opens at 62 degrees C once the engine is fully warmed up
• Allows coolant to flow through the engine sooner, reducing and maintaining cooler engine temperatures
• Part number: MMTS-CIV-06
• Mishimoto Lifetime Warranty

Frequently Asked Questions

• Q: Does this thermostat fit my Civic Si? A: Yes, if you have a 2006-2011 Honda Civic Si. This racing thermostat is a direct fit for that application.
• Q: What is included in the box? A: The purchase includes one Mishimoto racing thermostat. It is covered by the Mishimoto Lifetime Warranty.
• Q: At what temperature does it open? A: The thermostat opens at 62 degrees C once the engine is fully warmed up, which is lower than the standard Civic Si thermostat, so coolant flows through the engine sooner.

Review our Shipping Policy for delivery details, shipping costs and exclusions.

Eligibility, exclusions, applicable fees and exceptions are detailed in our Return Policy. Restrictions apply to special-order and custom products.

Proposition 65 Warnings: cancer and reproductive harm www.p65warnings.ca.gov