Compatible Subaru Models

The Mishimoto Performance Aluminum Radiator is compatible with:

• 2008 Subaru WRX
• 2008 Subaru STI
• 2009 Subaru WRX/STI
• 2010 Subaru WRX/STI
• 2011 Subaru WRX/STI
• 2012 Subaru WRX/STI
• 2013 Subaru WRX/STI
• 2014 Subaru WRX/STI
• 2015 Subaru WRX/STI
• 2016 Subaru WRX/STI
• 2017 Subaru WRX/STI
• 2018 Subaru WRX/STI
• 2019 Subaru WRX/STI

Perfect for:

• Track-day Subarus
• Flex fuel builds
• Big turbo setups
• Daily-driven WRXs
• Rally-inspired street cars
• High-horsepower STI projects

Because no Subaru owner leaves boost pressure stock emotionally.

Compatible with Subaru WRX or STI (2008–2019), the Mishimoto MMRAD‑STI‑08 performance aluminium radiator is engineered to deliver advanced cooling, reliable construction, and standout engine bay visuals.

Up to 30% Cooler Than Stock

One of the biggest upgrades is:

• Cooling temperatures up to 30% lower than stock

This dramatically improves:

• Heat dissipation
• Thermal stability
• Coolant efficiency
• Sustained cooling performance

Especially beneficial during:

• Track days
• Aggressive canyon driving
• Summer traffic
• High-boost pulls
• Spirited street driving

Where stock Subaru cooling systems occasionally begin spiritually overheating.

With a robust all‑aluminium build and a core that provides As much as 30% better cooling efficiency in comparison to OEM units, this radiator is very important for high‑performance driving, track use, or hot weather conditions.

Fully Brazed Aluminum Core

The radiator features:

• 100% brazed aluminum core
• TIG-welded end tanks
• Reinforced aluminum construction

This improves:

• Cooling consistency
• Pressure resistance
• Corrosion resistance
• Long-term reliability

Especially important because turbocharged EJ engines create:

• Massive thermal load
• Elevated coolant temperatures
• Continuous heat cycling
• Significant engine bay heat

And tuned STIs produce enough heat to concern nearby pavement naturally.

Crafted from aircraft‑grade 100% brazed aluminium, it features TIG‑welded end tanks and a sturdy magnetic drain plug to assemble metallic debris. A high‑pressure radiator cap allows coolant to go with the flow more efficiently at higher boiling points, even as the polished finish and clean welds strengthen the look under your hood.

Magnetic Drain Plug & High-Pressure Cap

The radiator also includes:

• Magnetic drain plug
• High-pressure radiator cap

The magnetic drain plug helps:

• Capture metal debris
• Protect cooling system components
• Improve long-term reliability

While the high-pressure cap helps:

• Improve coolant system stability
• Increase boiling resistance
• Maintain consistent cooling performance

Especially useful for:

• Track cars
• High-mileage WRXs
• Big turbo builds

Because old turbo Subarus occasionally create internal glitter with alarming commitment.

A thicker core increases cooling surface area and thermal mass, consistently maintaining coolant temperatures about 10 °F lower under demanding road or track conditions. Upgrading to this radiator helps minimise overheating risks, aligns with motorsport trends, and contributes to long‑term engine longevity.

Perfect for Track & Big Turbo Builds

This radiator is especially valuable for:

• Rotated turbo setups
• Flex fuel cars
• Time attack builds
• Road course Subarus
• Rallycross cars
• High-horsepower STI projects

Improved cooling helps reduce:

• Heat soak
• Coolant spikes
• Thermal fatigue
• Power loss under sustained load

Especially because EJ engines become dramatically less cooperative once temperatures rise aggressively.

Since 2005, Mishimoto has led performance cooling innovation, that specialize in engineering reliability through dyno testing and real‑world validation. This radiator reinforces that legacy with durable materials, precise manufacturing, and optimised cooling performance to keep your Subaru running strong.

Better Reliability for Daily Drivers

Even lightly modified WRXs benefit from:

• Improved cooling consistency
• Better thermal management
• Reduced overheating risk
• Preventative maintenance advantages

Especially important because:

• Turbo Subarus naturally run hot
• OEM cooling systems age over time
• Stop-and-go traffic becomes brutal in tuned cars

And hearing radiator fans at full speed constantly gets emotionally exhausting eventually.

Compatibility: Performance aluminum radiator compatible with Subaru Impreza WRX & STI, 2008-2019 for an exact OEM-style installation
Enhanced Cooling Efficiency: As much as 30 % cooler than stock radiators—maintains lower coolant temps all through track days, spirited driving, and hot weather

OEM-Style Direct Fit Installation

The radiator is engineered for:

• Direct-fit installation
• OEM hose compatibility
• Factory mounting integration

Typical installation requires:

• Coolant drain
• Socket set
• Hose clamp tools
• Approximately 2-4 hours

No major:

• Fabrication
• Cutting
• Custom mounting required

Which is fortunate, because Subaru engine bays already become crowded immediately after modifications begin.

Premium Construction: 100 % brazed aluminum core with TIG-welded end tanks, magnetic drain plug, and high-pressure cap—built to withstand corrosion and cracking
Style and Function: Thicker core offers improved heat dissipation and engine bay aesthetics with clean welds and polished finish
Peace of Mind: Constructed with high-performance materials and backed by Mishimoto’s high standards for durability and quality

Why Upgrade the WRX/STI Radiator?

Common reasons Subaru owners upgrade radiators include:

• Track overheating concerns
• Turbo heat management
• Preventative maintenance
• Big turbo cooling demands
• Reliability improvements
• Heat soak reduction

A performance radiator remains one of the smartest upgrades for turbo Subarus because:

• Heat kills consistency quickly
• EJ engines create enormous thermal load
• Modified WRXs overwhelm stock cooling systems fast

Especially once boost and ethanol combine forces.

Final Verdict

For 2008-2019 Subaru WRX and STI owners wanting serious cooling improvements and long-term reliability, the Mishimoto Performance Aluminum Radiator delivers major thermal management upgrades with rugged all-aluminum construction.

Key benefits include:

• Up to 30% cooler temperatures
• Fully brazed aluminum core
• TIG-welded end tanks
• Magnetic drain plug
• High-pressure radiator cap
• Direct-fit installation

Most importantly, your WRX finally stops treating every spirited drive like a head gasket stress test.