Crawford Performance Air Oil Separator V3 STI  2008-2021 w/ TMIC.

Dual Chamber Air Oil Separator (V3) AOS Kits

(7 products)
Industry-leading technology in Air Oil Separators: The Crawford V3 AOS. The most efficient separation yet and not available anywhere else. This design retains your OEM PCV valve to remain smog compliant, and is best suited for daily driver setups. Don't see a kit for your application? It is most likely still in R&D and not yet released. Check out the V2 kits that feature a wider range of fitment options, and better suited for track use. When the time comes and a V3 is released for your model, you can sell your V2 kit with it's great resale value, then upgrade to the V3 for 30% off!
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