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 IN STOCK 20-0607The Radium air/oil separator traps blow-by oil before it can be sent back to the induction system. The collected oil is heated by the AOS to remove moisture, then allowed to drain back into the engine block, making this a zero maintenance system. Installation is done using factory mounting points. A... Radium Engineering 2015+ Subaru STi Air Oil Separator-Return Kit 2015-2015 Subaru WRX STI Launch Edition 2015-2020 Subaru WRX STI Base / Limited 2016-2016 Subaru WRX STI Series.HyperBlue 2018-2018 Subaru WRX STI Type RA $427.45 |