Mishimoto X-Line Performance Aluminum Radiator-Subaru Impreza WRX & Sti 2001-2007

Part Details:

The Mishimoto Performance Aluminum Triple-Core Radiator is designed to provide increased cooling capacity for Subaru WRX and Impreza STI models by significantly improving heat dissipation compared to the factory radiator. The triple-core design allows for greater coolant volume and thermal efficiency, helping maintain stable engine temperatures under demanding conditions.

Constructed from durable aluminum and engineered with a high-efficiency triple-core cooling core, this radiator is built for applications where additional cooling headroom is needed. It installs as a direct-fit replacement using factory mounting points and remains compatible with stock fans and shrouds.

Performance & Cooling Capacity

The triple-core design increases surface area and coolant capacity compared to single- or dual-core radiators. This allows heat to be removed more effectively from the cooling system, helping reduce temperature fluctuations during aggressive driving, high ambient temperatures, or extended engine load.

Improved cooling consistency supports overall engine reliability and makes this radiator a strong option for performance-focused builds or vehicles operating in more demanding environments.

Design & Fitment

Designed as a direct OEM-style replacement, this radiator matches factory dimensions and mounting locations for proper alignment and secure installation. The aluminum construction also improves durability compared to aging factory radiators, making it suitable for long-term use in high-heat conditions.

Application & Compatibility

• Subaru WRX (2001–2007)
• Subaru Impreza STI (2004–2007)

Key Features

• Triple-core aluminum radiator construction
• Increased cooling capacity over OEM radiator
• Direct-fit replacement using factory mounting points
• Compatible with stock fans and shrouds
• Designed for consistent cooling under higher thermal loads

Whether you are looking for a reliable stock replacement radiator or a heat exchanger efficient enough for track abuse, the Mishimoto Subaru WRX and STI X-line Performance Aluminum Radiator is an ideal choice. As with all our products, this radiator is backed by 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.