Compatible Subaru Models

The Mishimoto Performance Aluminum Radiator is compatible with:

• 2001-2007 Subaru WRX
• 2001-2007 Subaru STI

Perfect for:

• Street builds
• Stage 2 setups
• Big turbo projects
• Track cars
• Daily-driven Subarus
• Rally-inspired builds

Because no WRX stays stock emotionally for very long.

Whether you day-to-day drive a stock STI or rallycross a modified WRX, an efficient cooling system is key to extending the life of your flat-four.

Massive Cooling Upgrade Over Stock

One of the biggest advantages is the:

• Full aluminum 2-row core design

Compared to the factory radiator, this improves:

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

Especially beneficial during:

• High boost pulls
• Aggressive canyon driving
• Track sessions
• Summer driving
• Stop-and-go traffic

Where factory cooling systems occasionally begin reconsidering their life choices.

The plastic end tanks of the stock radiator are especially liable to cracking from years of constant variation in temperature. A radiator failure may end up in overheating, head gasket failure, and other engine damage that can quickly put an end to a fun day at the track.

Thick 2-Row Performance Core

The Mishimoto radiator features:

• 2-row aluminum core
• 1.65-inch core thickness
• Increased cooling surface area

Specifications:

• Overall size: 28.4″ x 17.2″ x 2.15″
• Core size: 13.54″ x 27.24″
• Inlet/outlet size: 1.5″
• Tank wall thickness: 0.08″

This helps provide:

• Faster heat transfer
• Improved airflow cooling
• Reduced heat soak
• More stable coolant temperatures

Especially important because turbocharged EJ engines create heat like it’s part of the factory tune.

Give protection to your investment with the Mishimoto performance radiator engineered specifically for the 2001-2007 Subaru WRX and STI.

Full Aluminum Construction

Unlike factory radiators that commonly use:

• Plastic end tanks
• Crimped seams
• Aging seals

The Mishimoto unit uses:

• Fully welded aluminum construction
• Reinforced tank walls
• Performance-grade materials

This improves:

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

Because old Subaru plastic radiator tanks eventually crack with the predictability of sunrise.

After identifying the radiator in these vehicles as a weak point, our engineers set out to provide an efficient, durable radiator that can take the abuse of competitive driving and give you the reliability you wish to have for day-to-day commuting. The Mishimoto Subaru radiator features all-aluminum construction, which provides increased heat and pressure tolerance, improved heat dissipation, and improved cooling efficiency.

Better Cooling for Modified WRX & STI Builds

This radiator is especially useful for:

• Larger turbo setups
• E85 builds
• Track-focused cars
• High-boost street builds
• Rallycross applications

Improved cooling helps reduce:

• Heat soak
• Coolant temperature spikes
• Thermal stress
• Engine fatigue

Which matters because EJ engines already carry enough internet lore surrounding reliability.

The 100% brazed aluminum core and TIG-welded end tanks provide optimal durability and years of efficient and reliable service. This radiator is a complete bolt-in unit and replaces the factory radiator without requiring any modification to your Subaru.

Ideal for Track and Canyon Driving

Hard driving generates:

• Higher RPM heat
• Turbocharger heat soak
• Extended coolant stress
• Elevated oil temperatures

A larger aluminum radiator helps maintain:

• Stable engine temperatures
• More consistent power delivery
• Better long-session reliability

Especially during repeated pulls where stock cooling systems begin filing emotional complaints.

The Mishimoto Subaru Performance Aluminum Radiator includes a high-pressure 1.3 bar radiator cap. This cap effectively raises the boiling point of the coolant, thus providing a higher threshold for secure temperatures and resulting in a more efficient cooling system. This radiator provides a significant increase in coolant capacity, which allows for aggressive driving even as retaining secure coolant temperatures.

OEM-Style Direct Fit Installation

The radiator is engineered for:

• Direct bolt-in installation
• OEM hose compatibility
• Factory fan compatibility

Typical installation requires:

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

No major:

• Fabrication
• Custom mounting
• Hose modification typically required

Which is fortunate, because Subaru engine bays already resemble organized mechanical anxiety.

Keep your Subaru in the street and out of the shop with the Mishimoto Subaru WRX and STI Performance Aluminium Radiator. As with every our products, this radiator includes the Mishimoto Lifetime Warranty.

Why Upgrade the WRX/STI Radiator?

Common reasons owners upgrade radiators include:

• Overheating concerns
• Aging OEM radiator failure
• Turbo upgrades
• Track use
• Preventative maintenance
• Improved cooling reliability

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

• Heat destroys reliability quickly
• EJ motors are sensitive to temperature spikes
• Modified Subarus generate serious thermal load

Especially once “just a tune” becomes a full build sheet.

Direct fit for 2001-2007 Subaru WRX/STI
Overall Size: 28.4″ x 17.2″ x 2.15 / Core Size: 13.54″ x 27.24″ / Rows: 2
Inlet & Outlet: 1.5″ / Core Thickness: 1.65″ / Tank Wall Thickness: 0.08″

Final Verdict

For 2001-2007 Subaru WRX and STI owners wanting improved cooling performance and reliability, the Mishimoto Performance Aluminum Radiator delivers serious thermal management upgrades with OEM-style fitment.

Key benefits include:

• Full aluminum construction
• Thick 2-row cooling core
• Improved heat dissipation
• Better cooling stability
• Direct-fit installation
• Ideal for modified turbo builds

Most importantly, your WRX finally stops treating every spirited pull like a coolant temperature stress test.