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 Aluminium 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 aluminium 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.
X-Line Performance Aluminium Radiator, fits Subaru WRX 2008-2014/Subaru STI 2008-2021
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- Direct fit for the 2008-2014 Subaru WRX/2008-2021 STI
- Premium radiator has 3-row (2” thick) core for improved strength and reliability
- 16% 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
- Now includes two 1.3 bar high-pressure caps, raising the boiling point of engine coolant to provide a safer, more efficient system
- Two-way expansion tank cap and one-way radiator cap ensure proper flow and function of cooling system to avoid overheating
- Includes Magnetic Drain Plug to capture any metallic debris/fragments in your cooling system
- Mishimoto Lifetime Warranty
Key Features
- Direct fit for the 2008-2014 Subaru WRX/2008-2021 STI
- Premium radiator has 3-row (2” thick) core for improved strength and reliability
- 16% 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
- Now includes two 1.3 bar high-pressure caps, raising the boiling point of engine coolant to provide a safer, more efficient system
- Two-way expansion tank cap and one-way radiator cap ensure proper flow and function of cooling system to avoid overheating
- Includes Magnetic Drain Plug to capture any metallic debris/fragments in your cooling system
- Mishimoto Lifetime Warranty
| Overall Length (in) | 21.8 |
|---|---|
| Overall Height (in) | 28 |
| Overall Width (in) | 2.5 |
| Core Length (in) | 13.39 |
| Core Height (in) | 27.09 |
| Core Thickness (in) | 2 |
| Rows | 3 |
| Inlet (in) | 1.54 |
| Outlet (in) | 1.54 |
| Drain Plug Thread Size | M12 x 1.5 |
| DPI | 13091/13093 |
| Applications | 2008-2014 Subaru WRX 2008-2019 Subaru STI 2009-2013 Subaru Forester XT 2005-2009 Subaru Outback XT 2005-2009 Subaru Legacy GT |
| Engine Codes | EJ255 EJ257 |
| Chassis Codes | GE GH |
| Note | This item is for Manual Transmission vehicles. For automatic applications, please purchase optional Mishimoto Universal Transmission Cooler Kit. |
(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
For years, Subaru enthusiasts have chosen our performance aluminum radiators as a reliable way to increase cooling capacity and durability beyond what factory equipment can provide. Built from fully brazed aluminum and engineered for a direct fit, these radiators have proven themselves in both daily driving and high-performance conditions. While the radiator itself is the heart of the system, smaller components are just as critical to long-term reliability. One of the most important is the radiator cap, and our latest update ensures that Subarus from 2002 onward equipped with dual radiator caps now receive exactly the right components for their system.
These Subarus feature a unique cooling arrangement that uses two separate radiator caps. The radiator is fitted with a one-way cap, while the expansion tank requires a two-way cap. Each cap is designed for a specific function, and together they maintain consistent pressure and coolant flow as the engine heats up and cools down.
Previously,
Mishimoto Automotive (“Mishimoto”) warrants its products under this lifetime limited warranty policy (“Warranty Policy”). This Warranty Policy applies solely to: (i) Mishimoto Products purchased directly from Mishimoto or Mishimoto authorized dealers (each a “Mishimoto Product” and collectively, the “Mishimoto Products”) and (ii) the original purchaser of such Mishimoto Product (“Purchaser”). This Warranty Policy is non-transferable and all claims under this Warranty Policy must be accompanied by the original sales receipt. The terms and conditions of this Warranty Policy are subject to change by Mishimoto at any time without notice.
For our complete warranty policy, please click here.
