Radium Engineering Air Oil Separator – Return Kit | 2015-2021 Subaru WRX STI (20-0607) Radium Engineering

All Radium products are carefully planned with thorough R&D and designed in-house using the latest computer simulation and modeling techniques. Extensive testing and evaluation ensures the performance of Radium products exceed consumer expectations. For these reasons, top motorsports competitors and enthusiasts worldwide rely on Radium Engineering products.