Mishimoto Performance Radiator

Whether you’re carving through back roads in your WRX or pushing your STI to the limit on track day, maintaining optimal coolant temperatures is essential to protecting your EJ engine. The factory radiator’s plastic end tanks and limited cooling capacity can quickly become a weak link, especially under the high demands of spirited driving or hot summer commutes. A failure in the cooling system can lead to overheating, head gasket issues, and costly repairs that cut your driving adventures short. The Mishimoto Performance Aluminum Radiator for the 2008–2014 Subaru WRX and 2008–2021 Subaru STI is engineered to be the ultimate safeguard for your engine, delivering improved cooling efficiency and durability over stock.

Built with a lightweight, dual-core design and 100% brazed aluminum construction, this radiator maximizes heat dissipation and withstands higher pressures to keep your engine performing at its best. The TIG-welded, polished end tanks add strength and a premium finish, while the direct-fit design ensures a straightforward installation with no cutting or modification required. The included high-pressure 1. 3 bar radiator cap raises the boiling point of your coolant for an extra margin of safety under heavy loads, and a second radiator cap is included for use on the expansion tank. With up to a 30% increase in cooling efficiency over the factory unit, this upgrade is ideal for daily driving, spirited runs, or competitive use.

Backed by the Mishimoto Lifetime Warranty, including accident protection, this radiator is built to keep your Subaru running strong for years to come.

Note:

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

  Caution

  The provided Mishimoto two-way cap (six-sided design) should replace the stock cap located on the expansion tank. The Mishimoto Performance Aluminum Radiator should utilize the included one-way cap (circular design with non-directional sticker).

  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 support@mishimoto. com.

  Use small fitting for:

  2008-2009 Subaru WRX

  2008-2019 Subaru STI

  Use large fitting for:

  2010-2014 Subaru WRX

  2005-2009 Subaru Legacy GT

  2005-2009 Subaru Outback XT

  2009-2013 Subaru Forester XT

• Install Difficulty: 3

• Direct fit for the 2008-2019 Subaru WRX/STI
• Direct fit for the 2008-2014 Subaru WRX/2008-2021 STI
• Full aluminum construction including durable, TIG-welded end tanks
• Full aluminum construction features durable, TIG-welded end tanks
• Features a two-row, 1.65-in thick, efficient brazed aluminum core
• Features a two-row, 1.65” thick brazed aluminum core
• Increased fluid capacity and optimal heat dissipation
• Increased coolant capacity directly results in improved cooling efficiency
• Provides efficient temperature reduction for use on the street, track, rallycross, or autocross course
• Includes Magnetic Drain Plug to capture any metallic debris/fragments in your cooling system
• Now includes two 1.3 bar high-pressure caps, raising the boiling point of engine coolant to provide a safer, more efficient system
• Includes high-pressure 1.3 bar radiator cap designed for Subaru applications with non-directional sticker
• Two-way expansion tank cap and one-way radiator cap ensure proper flow and function of cooling system to avoid overheating
• Second radiator cap is included for use on expansion tank
• Includes Magnetic Drain Plug to capture any metallic debris/fragments in your cooling system
• Mishimoto Lifetime Warranty

• Overall Height (in): 21.8
• Overall Length (in): 28
• Overall Width (in): 2.15
• Core Length (in): 27.08
• Core Height (in): 13.39
• Fluid Capacity (gal): 2.21
• Rows: 2
• Inlet (in): 1.54
• Outlet (in): 1.54
• Core Thickness (in): 1.65
• Drain Plug Thread Size: M12 x 1.5
• DPI: 13091/13093
• Engine Codes: EJ255, EJ257
• Chassis Codes: GE, GH
• Install Difficulty: 3

• (1) Mishimoto Radiator
• (1) Mishimoto Two-Way Radiator Cap
• (1) Mishimoto One-Way Radiator Cap
• (2) Overflow Ports
• (1) Magnetic Drain Plug
• Fan Mounting Hardware
• Mishimoto Lifetime Warranty

• Installation Instructions