Authorized Cobb Tuning Dealer
Fitment Information:
2015-2021 Subaru WRX
The COBB Air/Oil Separator is placed within your Subarus crankcase ventilation system and helps to prevent oil vapors from being introduced into the intake system. Oil vapors passing through your engine's intake system lower the effective octane rating of fuel and can contribute to both oil and carbon buildup over time.
Features:
The Subaru FA engine has 3 ports that vent crank pressure: one on each cylinder head and another on the top of the block. Each engine vent port receives its own connection to the AOS. By giving each engine port its own entrance to the AOS we have allowed for more effective and faster excavation of crankcase pressure. Additionally, this reduces overall system pressure. With a 4" OD and 5.75" height, the AOS has an approximate 1 liter of holding capacity. The larger the AOS, the more power you can safely make without having to worry about the AOS overfilling.
The bottom of the AOS is shaped like a snail, redirecting positive crank pressure into the same swirl pattern produced by the 3 side ports. Allowing maximum oil drainage while separating oil from the air in all the venting ports.
Should’ve been on the car from factory. Overall install is kind of a pain but it’s well worth it. The car seems much happier and smoother with this installed. Install is going to take some serious time but videos will help. Overall great product.
It was a difficult installation but got it done. The hoses get in the way with my aftermarket radiator and charge pipe. Put it all fit in the end.
Usual cobb high quality parts. It's iag v3 aos with a cobb logo on it. You pay a little extra for the carb sticker making it 50 state smog legal. I'm happy with it!
Highly recommend for all FA motors to extend engine lifespan
This AOS is a must have for your WRX!
The IAG/COBB is a great investment for the direct injected engine
