COBB Coolant Overflow Tank (800660) | Subaru WRX 2015-2021 / STI 2015-2021

The COBB Coolant Overflow Tank provides a stronger, more reliable solution compared to the factory plastic reservoir on your 2015–2021 Subaru WRX or STI. Built from high-quality aluminum, this tank delivers improved durability, heat resistance, and a clean, performance-focused appearance within the engine bay.

KEY FEATURES

• Aluminum construction replaces the OEM plastic tank for improved longevity
• Resists heat cycling, discoloration, and cracking common with factory reservoirs
• Direct-fit design integrates smoothly with factory coolant routing and mounting points
• Enhances the appearance of the engine bay with a premium, performance-oriented look
• Ideal upgrade for tuned, high-temperature, or track-driven FA and EJ platforms
• Provides long-term reliability for daily driving and performance applications

TECHNICAL SPECIFICATIONS

• TIG-welded aluminum body engineered for strength under constant temperature variation
• Powder-coated exterior offers corrosion resistance and clean presentation
• Designed to function with OEM cap and coolant hose layouts
• Includes factory-style bracketry and hardware for straightforward installation
• Maintains factory coolant system operation and pressure behavior

VEHICLE FITMENT

• Subaru WRX 2015–2021
• Subaru STI 2015–2021

COBB delivers proven, data-driven performance solutions engineered to optimize your Subaru with unmatched precision and reliability.