Mishimoto X-Line Performance Radiator

Whether you’re logging miles on your daily commute or chasing lap times at the track, keeping your Subaru’s flat-four cool is key to reliability and performance. The factory radiator’s limited capacity can quickly become a bottleneck under demanding conditions, putting your engine at risk of overheating and costly damage. The Mishimoto X-Line Performance Aluminum Radiator for the 2008–2014 Subaru WRX and 2008–2021 Subaru STI is designed to be the ultimate solution, offering maximum cooling efficiency and durability for any driving environment.

Engineered with a larger triple-row core, this radiator delivers significantly improved heat dissipation to keep coolant temperatures in check, even under extreme loads. Its 100% brazed aluminum construction and TIG-welded polished end tanks provide superior strength and longevity compared to the stock unit, while the lightweight design helps maintain vehicle balance and performance. The direct OEM fit ensures an easy, no-modification installation, so you can spend less time in the garage and more time enjoying your Subaru.

Every Mishimoto X-Line Performance Radiator includes a high-pressure 1. 3 bar radiator cap to raise the boiling point of your coolant, offering additional protection against overheating. Additionally, a second radiator cap is included for use on the expansion tank. Backed by the Mishimoto Lifetime Warranty with accident protection, this radiator is built to keep your WRX or STI running cool and 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.

  Due to the additional thickness of our 3-row X-Line radiator, trimming the upper hose may be necessary.

  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 2008-2014 Subaru WRX/STI
• Direct fit for the 2008-2014 Subaru WRX/2008-2021 STI
• Premium radiator has 3-row (2-in thick) core for improved strength and reliability.
• Premium radiator has 3-row (2” thick) core for improved strength and reliability
• 16-percent thinner-than-stock tubes allow for more surface contact, increasing cooling efficiency.
• 16% thinner-than-stock tubes allow for more surface contact, increasing cooling efficiency
• Greater density of rows for higher cooling capacity.
• Greater density of rows for higher cooling capacity
• More contact points for additional heat transfer.
• More contact points for additional heat transfer
• 3-row design creates more air turbulence, maximizing cooling efficiency
• Includes magnetic drain plug
• 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): 28
• Overall Length (in): 21.8
• Overall Width (in): 2.5
• Core Length (in): 13.39
• Core Height (in): 27.09
• Rows: 3
• Inlet (in): 1.54
• Outlet (in): 1.54
• Core Thickness (in): 2
• 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