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Note: Image is not vehicle specific. Your radiator will be specific to your vehicle.  If you have any questions about this radiator, please contact us.



  • Direct fit for the 2008-2014 Subaru WRX and 2008-2019 Subaru STI
  • Premium radiator has 3-row (2-in thick) core for improved strength and reliability.
  • 16-percent thinner-than-stock tubes allow for more surface contact, increasing cooling efficiency.
  • Greater density of rows for higher cooling capacity.
  • More contact points for additional heat transfer.
  • 3-row design creates more air turbulence, maximizing cooling efficiency
  • Includes magnetic drain plug
  • Includes a high-pressure 1.3 bar
  • Mishimoto radiator cap
  • Mishimoto Lifetime Warranty


The Mishimoto X Line performance aluminum radiator for the 2008-2014 Subaru WRX and 2008-2019 STI is designed with a larger 3 row core to maximize cooling efficiency, boost engine functions, and most importantly protect your car from overheating. It is the ideal upgrade to the stock Subaru radiator whether you drive your vehicle daily or take it for track runs.


The Mishimoto aluminum 2008-2014 Subaru WRX and 2008-2019 STI radiator features a lightweight triple core, 100-percent brazed aluminum, and polished end tanks, enhancing the overall performance of your engine. Every Mishimoto aluminum radiator is a direct OEM fit making installation effortless with no cutting or modification required, and as with every Mishimoto aluminum radiator, this radiator includes the Mishimoto Lifetime Warranty so you can have peace of mind!!



Fits 2008-2014 Subaru WRX and 2008-2019 Subaru STI with EJ 255/EJ257 Engine codes



- This item is for Manual Transmission vehicles. For automatic applications, please purchase optional Mishimoto Universal Transmission Cooler Kit


The provided Mishimoto radiator cap should replace the stock cap located on the expansion tank. The stock cap attached to the radiator should be installed on the Mishimoto Performance Aluminum Radiator. The Mishimoto radiator cap is a two way valve, while the stock radiator cap is a single valve. Due to the difference in construction, the Mishimoto cap cannot be used on the radiator. If the Mishimoto cap is fit on the radiator, overheating may occur.

It is the installer's responsibility to check all thermostat plugs, NPT plugs, line fittings, and other connections to assure they are fully tightened before operating the vehicle. Mishimoto recommends that you check all connections at regular intervals, especially during the first few miles after installation. For additional technical information, contact

Use small fitting for:
2008-2009 Subaru WRX
2008-2019 Subaru STI

Use large fitting for:
2010-2014 Subaru WRX

Part Number:


Mishimoto X-Line Performance Aluminum Radiator 2008-2014 WRX 2008-2019 STI

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