Mishimoto MMRAD-STI-08X - 08+ Subaru WRX/STi X-LINE (Thicker Core) Aluminum Radiator
Aluminum radiator engineered for efficient heat dissipation and optimal engine cooling. Precision-fit design ensures easy installation, corrosion resistance, and reliable performance across varied driving conditions.
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.
TechSpec Overall Height (in): 28
TechSpec Overall Length (in): 21.8
TechSpec Overall Width (in): 2.5
TechSpec Core Length (in): 13.39
TechSpec Core Height (in): 27.09
TechSpec Fluid Capacity (gal): N/A
TechSpec Rows: 3
TechSpec Inlet (in): 1.54
TechSpec Outlet (in): 1.54
TechSpec Core Thickness (in): 2
TechSpec Drain Plug Thread Size: M12 x 1.5
TechSpec DPI: 13091/13093
TechSpec Material: N/A
TechSpec Applications: 2008-2014 Subaru WRX--2008-2019 Subaru STI--2009-2013 Subaru Forester XT--2005-2009 Subaru Outback XT--2005-2009 Subaru Legacy GT
TechSpec Engine Codes: EJ255--EJ257
TechSpec Chassis Codes: GE--GH
TechSpec 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
TechSpec Includes: (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
SellingPoint01: Direct fit for the 2008-2014 Subaru WRX/2008-2021 STI
SellingPoint02: Premium radiator has 3-row (2” thick) core for improved strength and reliability
SellingPoint03: 16% thinner-than-stock tubes allow for more surface contact, increasing cooling efficiency
SellingPoint04: Greater density of rows for higher cooling capacity
SellingPoint05: More contact points for additional heat transfer
SellingPoint06: 3-row design creates more air turbulence, maximizing cooling efficiency
SellingPoint07: Now includes two 1.3 bar high-pressure caps, raising the boiling point of engine coolant to provide a safer, more efficient system
SellingPoint08: Two-way expansion tank cap and one-way radiator cap ensure proper flow and function of cooling system to avoid overheating
SellingPoint09: Includes Magnetic Drain Plug to capture any metallic debris/fragments in your cooling system
SellingPoint10: Mishimoto Lifetime Warranty
SellingPoint11: N/A
SellingPoint12: N/A
SellingPoint13: N/A
SellingPoint14: N/A
SellingPoint15: N/A
Install Difficulty: 3
Core Finish: Uncoated
Core Height: 27.09
Core Length: 13.39
Core Material: Aluminum
Core Row Quantity: 3
Core Thickness: 2
Down Flow Or Cross Flow Type: Down Flow
Drain Plug Included: Yes
Drain Plug Thread Size: M12 - 1.5
Fluid Capacity: 0
Inlet Diameter: 1.54
Inlet Location: Top Left
Outlet Diameter: 1.54
Outlet Location: Bottom Left
Overall Height: 28
Overall Length: 21.8
Overall Width: 2.5
Radiator Cap Included: Yes
Transmission Oil Cooler Fitting Type: N/A
Transmission Oil Cooler Included: No
