Mishimoto Performance Aluminum Radiator-Subaru Impreza WRX & Sti 2008-2018

Part Details:

The Mishimoto Performance Aluminum Radiator is designed to improve cooling efficiency on the Subaru Impreza STI by increasing coolant capacity and heat dissipation compared to the factory radiator. This upgrade helps maintain more consistent engine temperatures, especially under higher thermal loads caused by spirited driving, warm climates, or modified setups.

Built from durable aluminum and engineered with a high-efficiency cooling core, this radiator provides improved heat transfer while maintaining a direct OEM-style fit. It installs using factory mounting points and is compatible with the stock fans and shrouds, making it a straightforward replacement for the original radiator without the need for custom modifications.

Performance & Cooling Efficiency

Compared to the factory radiator, the Mishimoto aluminum radiator offers increased surface area and improved airflow through the core. This allows heat to be removed from the coolant more efficiently, helping reduce temperature spikes during aggressive driving or extended periods of engine load.

Improved cooling consistency can help support overall engine reliability by keeping operating temperatures within a stable range. This makes the radiator a practical upgrade for both daily-driven vehicles and performance-oriented builds.

Design & Fitment

Designed as a direct-fit replacement, this radiator is engineered to match factory dimensions and mounting locations. This ensures proper alignment, secure installation, and compatibility with existing cooling system components.

The aluminum construction also offers increased durability over aging factory radiators, making it a solid option when refreshing the cooling system or addressing heat-related issues.

Application & Compatibility

• Subaru Impreza STI (2008–2014)

Key Features

• High-efficiency aluminum radiator construction
• Increased cooling capacity compared to OEM radiator
• Direct-fit replacement using factory mounting points
• Compatible with stock fans and shrouds
• Designed to support consistent coolant temperatures

This radiator comes with a Mishimoto 1.3 Bar High-Pressure Radiator Cap and, like all our aluminum radiators, comes with the Mishimoto Lifetime Warranty.

Recommended Supporting Cooling Components

• Fans & Shrouds – help improve airflow through the radiator, especially during low-speed and stop-and-go driving.
• Cooling Hoses – ensure reliable coolant flow and are commonly replaced when upgrading radiators.
• Coolant Routing – supports efficient coolant circulation throughout the cooling system.
• Oil Coolers – complement radiator upgrades by helping manage oil temperatures under sustained load.

Learn more about Mishimoto cooling solutions and performance-focused radiator upgrades.