IAG Air-Oil Separator (AOS) For 08-14 Subaru WRX, 08-21 STI, 09-13 FXT, 05-09 LGT & OBXT

This is IAG’s maintenance-free air oil separator for this chassis. It is a real PCV control piece, not just a can you have to keep emptying.

• Cast aluminum canister with internal baffling to pull oil out of the PCV stream
• Returns separated oil back to the crankcase so it stays street friendly
• Built for 2008-2014 WRX, 2008-2021 STI, 2009-2013 Forester XT, 2005-2009 Legacy GT and Outback XT
• Helps keep oil out of the intake tract, intercooler, and charge piping

Why you’d want it: if the car sees spirited street driving, track time, or just long-term ownership where you want cleaner intake plumbing and better crankcase control, this is one of the better upgrades you can make.

This is the one I’d look at for a clean long-term PCV solution on the later EJ cars.

AOS Color: Choose Black, Red, Neon Yellow from the product options.