Koyo Radiator Cap for the 02-07 WRX & STI Koyo Radiator  E-mail this product to a friend previous | up | next  Koyo's Hyper radiator cap is a high performance unit engineered to provide 1.3 kg/cm3 of pressure which raises the boiling point of the coolant, allowing for more efficient cooling.      Designed for the 02-07 WRX & STI Koyo radiator, or 02 - 07 WRX and STI Over-flow tank. SKU: KOYO-SKC-13 Weight: 1.00 Regular Price: $30.00  On Sale For: $24.99  Quantity:

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