** FREE DOMESTIC SHIPPING ON ALL ORDERS OVER $150.00 **
Shop
Parts
Find My Car

Air Oil Separator for WRX/STI

$572.00 $486.20

  • SKU: PSP-ENG-606RD
  • Quantities low - Order Soon!

Air Oil Separator for WRX/STI

$572.00 $486.20

  • SKU: PSP-ENG-606RD
  • Quantities low - Order Soon!
Color -Red
Select Vehicle
Qty
Add to Cart

Overview

The PERRIN Air Oil Separator prevents oil from entering the intake by capturing it from the crankcase vents. This reduces carbon build-up, improves intercooler efficiency, and lowers the risk of performance-degrading detonation.

Jump To

Maintenance Free Closed Loop Operation

The PERRIN Air Oil Separator is not a catch can. Catch cans capture engine blow-by and stores it in a container, which requires constant attention and removal of oil every few hundred miles. The air oil separator separates the oil from the air, draining it back to the engine, which eliminates the need for constant attention and draining of oil. As oil drains from the bottom of the PERRIN Air Oil Separator, clean oil-free air vents out of the top to rejoin the intake tract.

Swirl Pot Technology

The PERRIN Air Oil Separator features swirl pot technology and multi-layer baffles. This design forces incoming engine blow-by to move rapidly across the baffles, separating oil from the engine blow-by. Multiple layers of baffles means more surface area to collect more oil, making for a compact and efficient design.

Oil entering from the crankcase vents spins counterclockwise through the entire body of the AOS, passing along four walls equaling roughly 50 sq/in of surface area. The multiple baffle walls in our compact design simulate the surface area of an AOS that is 13.5" tall!

Heated by Coolant

The base plate of the air oil separator is heated by coolant drawn from the engine. This heats the entire air oil separator to the same temperature as the engine blow-by. By keeping the air oil separator the same temperature as the blow-by, water condensation is significantly decreased, allowing oil, air, and water vapor to separate and pass through the body.

This vital feature eliminates nearly all the sludge that can build up in the air oil separator body, which is a common problem with catch cans and other air oil separators.

Increase Intercooler Efficiency

The PERRIN Air Oil Separator increases intercooler efficiency by reducing the amount of oil deposited into your intercooler and intake system! 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.

Reduce Carbon Buildup

Reduce carbon buildup in the combustion chamber, intake valves, and in your intake tract. Crankcase 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 valves.

CNC Machined Fittings

The low-profile aluminum fittings provided with the PERRIN Air Oil Separator are CNC machined and anodized black for both a clean, sleek look and corrosion resistance. These tough and durable fittings are designed and finished to last the life of your vehicle.

EJ AOS - Custom Drain Back Fitting

Instead of using a universal type fitting, we have designed a purpose built crank case fitting that does the job perfectly. Like the air oil separator body, the drain fitting is threaded to except virtually any kind of fitting to allow for easy customization on special projects.

2022+ WRX - Crank Case Fitting

Our unique crankcase vent fitting places the AOS in the perfect location to maintain the ideal temperature while staying out of the way of aftermarket TMIC's, FMIC's, charge pipes, master cylinder braces, and cold air intakes.

PERRIN Turbo Sump Pump Restrictor

Included with the PERRIN Air Oil Separator for 2015-2023 WRX, the PERRIN Turbo Sump Pump Restrictor fixes burning oil issues relating to turboback exhausts or Stage 2 and higher tunes. Click here to learn more.

Finish

Powder coated for protection against the elements, the finish will look awesome for years to come. The PERRIN Air Oil Separator is available in black, red, or neon yellow powder coating.

Subaru Specific

Subaru EJ engines have 3 crankcase type vent locations that are on the valve covers and center of the engine block. Subaru FA engines have 2 crankcase vent locations, both located on the engine block. Each PERRIN Air Oil Separator is designed to connect to each of these separately without requiring any T-connections. This allows for better venting and reduces the chance of oil being ingested during high G corners (a common issue on flat-type or boxer engines).

No Tuning Required

Increase horsepower and torque without ECU recalibration or tune! This part is designed and tested to work safely on your vehicle without any tuning required! However, more power can be gained with proper ECU tuning! Confirm any tune or recalibration you add is specific for ALL modifications added to the vehicle. Questions? Contact [email protected].

Product Details

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

NOTE:

* 2002-2007 WRX - 2002-2005 WRX installation requires the removal of the cruise control module
* 2015-2021 WRX - Modifications may be needed if installed with an after-market air intake box, contact tech for further details
* 2015-2021 WRX- Does not work on vehicles with EyeSight

*For left-hand drive cars only

  • 2004 Subaru STI
  • 2005 Subaru STI
  • 2006 Subaru STI
  • 2007 Subaru STI
  • 2008 Subaru STI
  • 2009 Subaru STI
  • 2010 Subaru STI
  • 2011 Subaru STI
  • 2012 Subaru STI
  • 2013 Subaru STI
  • 2014 Subaru STI
  • 2015 Subaru STI
  • 2016 Subaru STI
  • 2017 Subaru STI
  • 2018 Subaru STI
  • 2019 Subaru STI
  • 2020 Subaru STI
  • 2021 Subaru STI
  • 2002 Subaru WRX
  • 2003 Subaru WRX
  • 2004 Subaru WRX
  • 2005 Subaru WRX
  • 2006 Subaru WRX
  • 2007 Subaru WRX
  • 2008 Subaru WRX
  • 2009 Subaru WRX
  • 2010 Subaru WRX
  • 2011 Subaru WRX
  • 2012 Subaru WRX
  • 2013 Subaru WRX
  • 2014 Subaru WRX
  • 2015 Subaru WRX
  • 2016 Subaru WRX
  • 2017 Subaru WRX
  • 2018 Subaru WRX
  • 2019 Subaru WRX
  • 2020 Subaru WRX
  • 2021 Subaru WRX
  • 2022 Subaru WRX
  • 2023 Subaru WRX
  • 2024 Subaru WRX
5 Year Warranty

PERRIN Performance warrants to the original purchaser that all PERRIN products will be free from defects in material and workmanship within a sixty (60) month period from the date of purchase. *Some exclusions apply

Proposition 65

warning.pngWARNING: Cancer and Reproductive Harm
www.P65Warnings.ca.gov

Off Road Use Only

This product is legal in California only for racing vehicles which may never be used upon a highway. Check your local and federal laws prior to installation.

Estimated DIY Install Time: 3 hours
Email Our Tech Department: [email protected]
Download Instructions
Video

Installation Video

Installation Video

Gallery

Installation Gallery

PERRIN Performance Subaru Air Oil Separator Guide

Improve engine performance and longevity by adding a PERRIN Air Oil…

Customers also purchased

Oil Cooler Kits for WRX & STI

WRX, STI
$764.15

2.4" Turbo Inlet Hose for WRX/STI

WRX, Outback XT, Legacy GT, Forester XT, STI
$283.05

Cobb AccessPORT

WRX, STI, Outback XT, Legacy GT, Ascent, Forester XT
$725.00

Top Mount Intercooler for 2022-2024 WRX

WRX
$829.60
Added To Cart
Air Oil Separator for WRX/STI
$486.20
  • SKU: PSP-ENG-606RD
  • Quantities low - Order Soon!
View Cart & Checkout Now
Continue Shopping

Add to Wishlist

Thank you!

Thank you for signing up.

© 2024 PERRIN - All Rights Reserved
  • Visa
  • Mastercard
  • PayPal
  • Wire Transfer