Add some additional reliability and engine bay styling with the Mishimoto Expansion Tank For Subaru WRX/STI 2001-2007. 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 Subaru WRX/STI! The Mishimoto Coolant Expansion Tank is engineered for perfect fitment in the 2002-2007 WRX and the 2004-2016 STI As with all our products, this expansion tank includes the Mishimoto Lifetime Warranty