Upgrade the cooling system of your 2012-2015 Honda Civic Si with the Mishimoto MM-RAD-CIV-12SI Performance Aluminum Radiator. Designed for the high-revving K-series engine, this radiator provides increased thermal capacity for daily driving, spirited street use, canyon runs, and weekend track sessions. Its all-aluminum construction and precision TIG-welded end tanks eliminate the factory radiator’s plastic components, helping resist cracking caused by repeated heat cycling and sustained high-rpm operation. A 63% increase in core volume over the original radiator provides greater surface area for efficient heat dissipation and helps maintain stable coolant temperatures when your Civic Si is pushed hard.
Designed as a direct-fit replacement, the Mishimoto Performance Aluminum Radiator installs without cutting, fabrication, or modifications. It is compatible with the factory hoses and cooling system components, allowing a straightforward installation using the original mounting points. An included high-pressure radiator cap helps maintain proper system pressure and supports the radiator’s enhanced cooling performance from the first drive. The included Mishimoto Magnetic Drain Plug captures ferrous metallic debris before it circulates through the cooling system, helping protect engine internals and support long-term cooling system serviceability.
Built for drivers who demand reliable temperature control from their Honda Civic Si, this radiator is engineered to handle sustained thermal demands beyond the capability of the stock unit. The corrosion-resistant aluminum construction supports dependable performance across varied driving conditions, while the direct-fit design keeps installation convenient for street cars and performance builds alike. The Mishimoto MM-RAD-CIV-12SI is backed by Mishimoto’s Lifetime Warranty, providing lasting coverage for a critical cooling system upgrade. Fits 2012, 2013, 2014, and 2015 Honda Civic Si models.
Features:
- Engineered for the high-revving K-series engine in the 2012-2015 Honda Civic Si
- 63% greater core volume than the factory radiator for increased cooling capacity
- All-aluminum construction with precision TIG-welded end tanks for durability under repeated heat cycling
- Direct-fit replacement installs without cutting, fabrication, or modifications
- Compatible with factory hoses and cooling system components
- Included high-pressure radiator cap helps maintain optimal system pressure
- Included magnetic drain plug captures ferrous debris to help protect engine internals
- Corrosion-resistant design supports reliable cooling across varied driving conditions
- Backed by Mishimoto’s Lifetime Warranty
Fitment:
2012 Honda Civic Si
2013 Honda Civic Si
2014 Honda Civic Si
2015 Honda Civic Si
