Alloy Expansion Coolant Tank for Subaru Impreza WRX / STI 2002-2014

Aluminum Coolant Expansion Tank for Subaru WRX & WRX STI (EJ Series)

Upgrade your Subaru’s cooling system with a direct-fit aluminum coolant expansion tank, engineered specifically for turbocharged EJ-series engines. Designed to replace the factory plastic tank, this unit delivers improved durability, heat resistance, and long-term reliability—critical for performance-driven WRX and STI platforms.

Subaru’s EJ engines are legendary for their turbo performance and motorsports heritage, but factory plastic expansion tanks are known to weaken, discolor, and crack over time due to constant heat cycles. This high-quality alloy/aluminum expansion tank eliminates that weak point, giving you peace of mind whether you’re daily driving, canyon carving, or pushing boost.

Vehicle Fitment

Direct bolt-on fit for:

• 2002–2007 Subaru Impreza WRX

• 2004–2014 Subaru Impreza WRX STI

Compatible Engine Codes:

• EJ205

• EJ255

• EJ257

• EJ207

No modifications required. Designed to mount in the factory location using OEM connections.

Key Features & Benefits

• Direct Fit Design – Installs easily using factory mounting points

• High-Quality Aluminum Construction – Far more resistant to heat and pressure than OEM plastic

• Improved Reliability – Reduces risk of coolant leaks and tank failure

• Enhanced Engine Bay Appearance – Clean, performance-focused upgrade

• Ideal for Stock or Modified Builds – Supports daily driving and high-boost applications

Why Upgrade Your Expansion Tank?

Turbocharged EJ engines generate significant heat, especially under boost. An aluminum expansion tank helps maintain cooling system integrity, ensuring consistent coolant flow and reducing the likelihood of overheating caused by brittle factory components. This upgrade is especially recommended for WRX and STI owners running higher temperatures, spirited driving, or long-term ownership plans.

Perfect For:

• WRX & STI owners replacing aging OEM plastic tanks

• Performance builds and reliability-focused upgrades

• Preventive maintenance on EJ-series engines

Upgrade a known weak point with a solution built to last.
Install once. Drive with confidence.