Vehicle Compatibility

Subaru Legacy GT

• 2005 Subaru Legacy GT
• 2006 Subaru Legacy GT
• 2007 Subaru Legacy GT
• 2008 Subaru Legacy GT
• 2009 Subaru Legacy GT

Subaru WRX

• 2008 Subaru WRX
• 2009 Subaru WRX
• 2010 Subaru WRX
• 2011 Subaru WRX
• 2012 Subaru WRX
• 2013 Subaru WRX
• 2014 Subaru WRX

Subaru Forester XT

• 2004 Subaru Forester XT
• 2005 Subaru Forester XT
• 2006 Subaru Forester XT
• 2007 Subaru Forester XT
• 2008 Subaru Forester XT
• 2009 Subaru Forester XT
• 2010 Subaru Forester XT
• 2011 Subaru Forester XT
• 2012 Subaru Forester XT
• 2013 Subaru Forester XT

Engine Compatibility

✅ EJ255

✅ EJ257-Based Applications

✅ Turbocharged 2.5L Subaru Models

❌ Naturally Aspirated Models

Always verify fitment before ordering.

Why Upgrade the Factory Top Mount Intercooler?

Factory Subaru intercoolers work well for stock power levels, but as boost increases, so do intake temperatures.

Common issues include:

• Heat soak
• Power loss
• Reduced boost efficiency
• Inconsistent performance

A larger intercooler helps address these concerns.

How a Top Mount Intercooler Works

Turbochargers compress air before it enters the engine.

Compression creates heat.

Hot intake air can result in:

• Reduced horsepower
• Increased knock potential
• Less efficient combustion
• Reduced tuning headroom

The intercooler cools compressed air before it enters the intake manifold.

Large Aluminum Core Design

The intercooler features a sizable aluminum core.

Core Dimensions

• Length: 11 inches
• Width: 10.75 inches
• Thickness: 5 inches

The larger core provides:

• Increased cooling capacity
• Better heat dissipation
• Improved airflow
• Reduced intake temperatures

Aluminum Construction

The all-aluminum design offers several advantages.

Benefits include:

• Excellent thermal conductivity
• Lightweight construction
• Corrosion resistance
• Improved durability

Aluminum remains the preferred material for most high-performance intercoolers.

Reduced Heat Soak

Heat soak occurs when the intercooler absorbs and retains heat after repeated acceleration.

Symptoms include:

• Loss of power
• Reduced boost performance
• Higher intake temperatures

A larger intercooler helps reduce these effects and maintain consistent performance.

Perfect for Modified EJ Engines

Many Subaru enthusiasts install:

• ECU tuning
• Larger turbochargers
• Downpipes
• Exhaust systems
• Cold air intakes

As power increases, intercooler efficiency becomes increasingly important.

Great for Daily Drivers

Even stock or lightly modified Subarus can benefit from improved cooling.

Advantages include:

• More consistent performance
• Better throttle response
• Improved reliability
• Reduced thermal stress

Excellent for Track and Autocross Use

Track Days

Helps maintain performance during repeated hard laps.

Autocross

Reduces temperature spikes between runs.

Canyon Driving

Provides more consistent power delivery.

Daily Driving

Improves cooling during hot weather operation.

Top Mount vs Front Mount Intercoolers

Many Subaru owners debate between top-mount and front-mount setups.

Advantages of Top Mount Intercoolers

• Faster boost response
• Simpler installation
• Retains factory routing
• Lower overall cost

Advantages of Front Mount Intercoolers

• Greater cooling potential
• Better airflow exposure
• Higher horsepower capability

For most street-driven WRXs and Legacy GTs, a quality top-mount intercooler remains an excellent choice.

Installation Considerations

Before installation:

• Verify intercooler dimensions
• Inspect Y-pipe connections
• Replace worn couplers
• Check hood scoop ducting

Proper sealing is critical for maximizing cooling efficiency.

Pros and Cons

Pros

• Large cooling core
• Aluminum construction
• Improved charge-air cooling
• Reduced heat soak
• Supports modified turbo setups
• Direct-fit Subaru applications

Cons

• Fitment should be verified carefully
• Top-mount designs still experience some heat soak
• Installation required
• Not as capable as large front-mount systems at extreme power levels

Frequently Asked Questions

Does this fit a 2006 Legacy GT?

Yes. The 2005-2009 Legacy GT is one of the primary applications.

Will it fit a 2011 WRX?

Yes. The 2008-2014 WRX is included in the supported fitment range.

Does it fit naturally aspirated Subarus?

No. This intercooler is designed for turbocharged applications.

Is aluminum better for intercoolers?

Yes. Aluminum provides excellent heat transfer and durability for charge-air cooling systems.

Final Thoughts

The Top Mount Intercooler for the Subaru Legacy GT, WRX, and Forester XT is a worthwhile upgrade for enthusiasts looking to improve charge-air cooling while retaining the factory-style top-mount configuration. With a large aluminum core and compatibility across several popular EJ-powered platforms, it helps reduce heat soak and maintain consistent turbo performance.

Because when your hood scoop is feeding air directly into the intercooler, it might as well have something substantial to cool.