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Manley Subaru WRX/STi Valve Spring and Retainer Kit (w/o Valve Locks) (16 each) - 26180
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Manley Subaru WRX/STI 16pc Valve Springs  (1.050/.755)  (for use with 23180-16 Retainers) - 22180-16
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Manley Subaru WRX/STi .490in Valve Spring and Retainer Kit (w/o Valve Locks) (16 each) - 26185