Perrin Red Air Oil Separator Subaru WRX 2002-2014 / STI 2004-2021 w/ FMIC

Rated 5.0 out of 5
Based on 1 review
41 In stock
Engine Air Oil Separator

🚀 If you were a VIP member, you'd be getting $28.60 in BuildBUX for buying this part 🤷 Join us!


Fastrak Delivery: , Order within hours minutes



Fitment Information:

2002-2014 Subaru WRX w/ Front Mount Intercooler

2004-2021 Subaru STI w/ Front Mount Intercooler

2005-2009 Subaru Legacy GT w/ Front Mount Intercooler

2005-2009 Subaru Outback XT w/ Front Mount Intercooler


  • Reduces the chances of detonation 
  • Traps oil from the crankcase ventilation before it enters the intake system
  • Increases intercooler efficiency by reducing the amount of oil deposited into your intercooler and intake system
  • Reduces carbon buildup in the combustion chamber, intake valves, and intake tract
  • Separates engine oil from water vapors and allows the oil to drain back into the engine
  • Durable Wrinke Red Powder Coating
  • Difficult Installation Effort
  • Estimated Installation Time - 3 Hours
  • Installation Instructions
  • No Tuning Required

    What's in the Box:

    • (1) PERRIN Air Oil Separator
    • (1) Car Specific Bracket
    • (1) PERRIN License Plate Frame
    • All necessary hardware for installation
    • Warranty & Instructions

    As blow-by/oil builds up inside your intercooler, the less efficient it becomes due to less heat being transferred away from your engine. This leads to power loss and detonation, which can be damaging to your engine. The AOS will reduce carbon build up in the combustion chamber, intake valves, and in your intake tract. The crank case blow-by is recirculated back to the intake to be ingested by the engine, but in doing so, gets stuck in the intake tract, intake valves, and the intercooler. This builds up over time which causes a loss in power and extra wear and tear on your valve train.

    average rating 5.0 out of 5
    Based on 1 review
    • 5 Stars
      1 Review
    • 4 Stars
      0 Reviews
    • 3 Stars
      0 Reviews
    • 2 Stars
      0 Reviews
    • 1 Star
      0 Reviews
    100% of reviewers would recommend this product to a friend
    Customer photos and videos
    1 Review
    Reviewed by Xavier L., from United States
    I recommend this product
    Rated 5 out of 5
    Review posted

    Great product

    The Perrin Air oil separator is a great investment. I’ve had it installed for a few weeks now and my car’s performance and efficiency has improved. An air oil separator is worth the money.

    Was this helpful?
    Perrin Red Air Oil Separator Subaru WRX 2002-2014 / STI 2004-2021 w/ FMIC
    You have successfully subscribed!
    This email has been registered