Mishimoto 06+ Honda Civic Si Racing Thermostat 68 Degrees

SKU: MMTS-CIV-06 | UPC: 748354801828

Mishimoto 06+ Honda Civic Si Racing Thermostat 68 Degrees

Lower your engine’s operating temperature with the Mishimoto 68C racing thermostat, engineered as a direct replacement for 2006+ Honda Civic Si and compatible K-series vehicles including Acura TSX, RDX, and Honda CR-V models. This thermostat opens at 68 degrees Celsius to promote faster warmup and sustained lower coolant temperatures during track or street driving. Ideal for performance enthusiasts seeking reliable cooling in high-demand conditions.

Key Features

• 68C Opening Temperature: Opens 14C earlier than OEM 82C unit to reduce operating temps by 15-20F and improve heat management
• Direct Fit Design: Bolts into factory housing on K20/K24 engines with no modifications for seamless integration
• High-Flow Construction: Enhanced coolant circulation maintains consistent temperatures under load for better power delivery
• Durable Materials: Brass pellet and stainless steel spring resist corrosion and wear for long-term reliability
• Included Gasket: OEM-style O-ring ensures leak-free seal right out of the box

Product Notes

• Pair with Mishimoto radiator hoses for complete cooling upgrade
• Flush cooling system prior to installation to remove contaminants
• Box dimensions 6.5 x 4.5 x 2.5 inches, weight 0.35 lbs

Installation Notes

• Professional installation recommended.
• Drain coolant completely before removing stock thermostat
• Torque bolts to 8-10 ft-lbs. compatible with factory hardware

This Part Fits

Year	Make	Model	Submodel
2007-2008	Acura	RDX	Base
2004-2008	Acura	TSX	Base
2006-2012	Honda	Civic	DX
2006-2013	Honda	Civic	EX
2009-2013	Honda	Civic	EX-L
2006-2012	Honda	Civic	GX
2012-2013	Honda	Civic	HF
2006-2013	Honda	Civic	Hybrid
2009-2013	Honda	Civic	Hybrid-L
2006-2013	Honda	Civic	LX
2009-2011	Honda	Civic	LX-S
2008	Honda	Civic	MUGEN Si
2013	Honda	Civic	Natural Gas
2006-2013	Honda	Civic	Si
2007-2013	Honda	CR-V	EX
2007-2013	Honda	CR-V	EX-L
2007-2013	Honda	CR-V	LX
2011	Honda	CR-V	SE

Why Choose Mishimoto?

• Engineered and tested for K-series applications in racing environments
• Direct OEM replacement with precision tolerances
• Lifetime warranty against defects

Frequently Asked Questions

• Q: Will this fit my 2006-2011 Honda Civic Si K20Z3?
  A: Yes, direct bolt-on replacement for factory thermostat housing on 2006-2011 Civic Si and other listed K20/K24 models
• Q: What is the construction material?
  A: Features corrosion-resistant brass body with stainless steel spring and high-temperature polymer pellet for reliable operation
• Q: What warranty is provided?
  A: Mishimoto Lifetime Warranty covers manufacturing defects when installed and maintained properly

Shipping & Handling

• Method: UPS Ground or USPS Priority
• Availability: In stock – ships same or next business day
• Packaging: Secure retail box 6.5 x 4.5 x 2.5 inches
• Weight: 0.35 lbs