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Add some additional reliability and engine bay styling with the Mishimoto Aluminum Coolant Expansion Tank for the Subaru WRX 2002-2007 / STI 2004-2016. Stock coolant expansion tanks are prone to failure after years of constant temperature variations. The Mishimoto tank is constructed from durable, TIG-welded aluminum with barbed fittings for optimal durability and longevity. This expansion tank provides a 50% increase in capacity compared to the stock unit. It features a polished silver or anodized black finish that will look great in your engine bay, and it matches the Mishimoto Performance Aluminum Radiator for the Subaru WRX/STI! The Mishimoto Coolant Expansion Tank is engineered for perfect fitment in the Subaru WRX 2002-2007 / STI 2004-2016! As with all our products, this expansion tank includes the Mishimoto Lifetime Warranty