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The COBB coolant overflow tank for Subaru WRX and STI models (2015–2021) replaces the factory reservoir with a purpose-built expansion tank to improve coolant containment and visual monitoring. Precision-formed to fit under the factory mounting and plumbing points, it’s a direct-fit upgrade for owners wanting a clean, serviceable replacement.
Cobb Subaru 15-21 WRX/STI Coolant Overflow Tank
