Aluminum Coolant Expansion Tank – Subaru WRX & WRX STI (2002–2014 EJ Series)

Eliminate a critical weak point in your Subaru's cooling system with this precision-engineered aluminum coolant expansion tank. Built specifically for turbocharged EJ-series engines, this direct-fit upgrade replaces the failure-prone factory plastic tank with heat-resistant aluminum construction—delivering the reliability your WRX or STI demands, whether you're commuting daily or chasing apex speeds on your favorite backroad.

Rally-Proven Engineering Meets Daily Reliability

The Subaru WRX and STI have earned legendary status through decades of rally dominance and turbocharged performance. Your EJ engine's boxer layout and turbo configuration create intense heat cycles that push factory plastic components beyond their limits. Over time, the OEM expansion tank becomes brittle, discolored, and prone to catastrophic cracking—often without warning. This aluminum upgrade transforms that liability into a permanent solution, maintaining optimal coolant pressure and flow even under the most demanding conditions.

Built to Outlast Your Boost Goals

Precision-crafted from high-grade aluminum alloy, this expansion tank withstands extreme temperature fluctuations and pressurization that destroy plastic alternatives. The durable construction resists warping, cracking, and degradation—ensuring your cooling system performs flawlessly for years to come. Beyond functionality, the clean aluminum finish elevates your engine bay aesthetics with a performance-focused appearance that matches your Subaru's motorsport heritage.

Performance Advantages

• Direct OEM Replacement: Bolt-in fitment using factory mounting points—no modifications required
• Superior Heat Resistance: Aluminum construction handles extreme temperatures plastic cannot survive
• Prevents Coolant System Failure: Eliminates risk of sudden tank rupture and coolant loss
• Supports Modified Builds: Handles increased heat from upgraded turbos and higher boost levels
• Long-Term Durability: Install once and forget it—built to outlast multiple factory replacements
• Enhanced Engine Bay: Clean, professional appearance that showcases attention to detail

Perfect Fitment for Your Subaru

Engineered specifically for 2002–2007 Subaru Impreza WRX and 2004–2014 Subaru Impreza WRX STI models equipped with EJ-series engines (EJ205, EJ255, EJ257, EJ207). Direct bolt-on installation ensures seamless integration with your factory cooling system—no cutting, welding, or custom fabrication needed.

Why This Upgrade Matters

Turbocharged EJ engines operate at elevated temperatures, especially during spirited driving or track sessions. A failing expansion tank doesn't just leak coolant—it can lead to overheating, head gasket damage, and catastrophic engine failure. This aluminum tank provides insurance against one of the most common failure points in the WRX/STI platform, giving you confidence whether you're logging highway miles or pushing your car to its limits.

Protect your investment with a cooling system upgrade designed for the demands of turbocharged performance. Install once, drive with confidence.