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I miss my STI. I didn't realize how good it was until it was gone : r/WRXSTi
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The IAG Performance AOS Air / Oil Separator is a must for turbo Subaru WRX STIs. It separates oil from the PCV system and directs gasses to the turbo
IAG Air / Oil Separator (AOS) For 2008-14 Subaru Impreza WRX & 2008-21 STI
Subaru OEM IHI VF48 Turbocharger Subaru STI 2008+