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PERRIN Air Oil Separator black for 2002-2021 Subaru WRX and 2004-2021 STI front view
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PERRIN Air Oil Separator black for 2002-2021 Subaru WRX and 2004-2021 STI top detail view
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PERRIN 02-21 Subaru WRX / 04-21 STI Air Oil Separator - Black

PERPSP-ENG-620BK
PSP-ENG-620BK
Oil Separators
Out of stock
$ 529.00 $ 396.75

SKU: PSP-ENG-620BK


PERRIN Air Oil Separator – Black – 2002-2021 Subaru WRX / 2004-2021 STI

The PERRIN PSP-ENG-620BK Air Oil Separator for 2002-2021 Subaru WRX and 2004-2021 STI. High-capacity baffled design with black anodized finish traps oil vapor, prevents blow-by contamination, reduces carbon buildup on intake valves and turbo, and maintains clean intake charge.

Key Features

  • High-Capacity Baffled Design – Effectively separates oil from blow-by vapors before re-entering the intake
  • Black Anodized Finish – Premium black coating for corrosion resistance and standout engine bay appearance
  • WRX/STI Specific – Engineered for direct fitment on 2002-2021 WRX and 2004-2021 STI models
  • Prevents Oil Contamination – Keeps intercooler, intake valves, and turbo clean for consistent performance
  • Easy Installation – Bolt-on replacement with all necessary hardware and fittings included
Spec Detail
Part Number PSP-ENG-620BK
Brand PERRIN Performance
Type Air Oil Separator
Finish Black Anodized
Compatibility 2002-2021 Subaru WRX / 2004-2021 Subaru STI
Country of Origin United States
Warranty PERRIN Limited Lifetime Warranty

Whats Included

  • 1 x PERRIN Air Oil Separator (black anodized)
  • All necessary hoses, fittings, and mounting hardware
  • Installation instructions

Product Notes

  • Designed specifically for 2002-2021 Subaru WRX and 2004-2021 STI models
  • Prevents oil vapor from coating intake tract and turbo components
  • Ideal for stock, tuned, or high-boost WRX/STI applications

Installation Notes

  • Bolt-on replacement for factory PCV system components
  • Estimated time: 1–2 hours
  • Professional installation recommended for proper hose routing and torque

This Part Fits

Year Range Make Model Trim / Engine Notes
2002-2021 Subaru WRX All trims Air Oil Separator
2004-2021 Subaru STI All trims Air Oil Separator

Why Choose PERRIN Air Oil Separators?

  • #1 choice for effective blow-by separation on modern turbo Subarus
  • Built & tested in the United States
  • Chosen by WRX/STI owners for cleaner intake, sustained power, and signature black anodized styling

Frequently Asked Questions

  • Q: Does this fit my 2018 Subaru WRX?
    A: Yes, direct fit for 2002-2021 Subaru WRX and 2004-2021 STI models.
  • Q: Does it require tuning?
    A: No, bolt-on design works with stock ECU; gains are noticeable without tuning.
  • Q: How often should I drain it?
    A: Drain periodically (every oil change recommended) to remove collected oil and maintain performance.

Shipping & Handling

  • Method: Ground UPS or FedEx
  • Availability: In stock – ships same or next business day
  • Packaging: Official PERRIN retail box

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