Air and Fuel› Air Cleaners, Filters, Intakes and Components

Perrin Performance

Air Oil Separator

$505.00

SKU: PSP-ENG-622

In Stock
In Stock
Ships by Sep 13
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Overview

The Perrin Performance Air Oil Separator V2 is an engine component designed to enhance longevity by separating oil vapors from crankcase gases. This prevents oil vapor contamination in the intake tract, which can lead to carbon buildup and degraded performance. It is built with a CNC-machined aluminum body and a durable ceramic coating.
Show original supplier description
The Perrin Air Oil Separator V2 is a precision-engineered solution designed for the 2022-2025 Subaru WRX to enhance engine longevity by effectively separating oil vapors from crankcase gases before they reach the intake manifold. By preventing oil vapor from contaminating the intake tract, this component helps mitigate carbon buildup that can degrade performance and increase maintenance requirements. Constructed from CNC-machined aluminum with a durable red ceramic coating, the unit offers enhanced resistance to heat and corrosion while reducing internal oil adhesion for improved long-term efficiency. This separator integrates seamlessly with the factory PCV system and does not require engine tuning or additional modifications for operation. Installation is considered DIY-friendly, requiring only basic hand tools to complete. While it provides a direct bolt-on fit for 2022-2025 Subaru WRX models, owners should verify fitment for their specific year and trim level. Please note that this product is not CARB legal and is not for sale in California.
Vehicle Symptoms
  • Excessive oil consumption between oil changes
  • White or blue smoke from exhaust on startup
  • Rough idle or hesitation when accelerating
  • Visible oil residue in intake piping or throttle body
  • Decreased fuel economy over time
Diagnostic Codes
  • P0300 – random misfire
  • P0301 – Cylinder 1 misfire Det
  • P0302 – Cylinder 2 misfire Det
  • P0303 – Cylinder 3 misfire Det
  • P0304 – Cylinder 4 misfire Det
  • P0171 – FT Malf (B1)
  • P0172 – FT Sys Lean (B1)
  • P0420 – Cat Sys Efficiency Below Threshold (B1)
Relevant Conversations
  • 2022 WRX excessive oil consumption fix
  • Perrin AOS V2 vs IAG AOS for WRX
  • P0300 misfire on 2023 Subaru WRX
  • How to install Perrin AOS on VB chassis WRX
  • WRX carbon buildup prevention catch can vs AOS
  • White smoke from exhaust WRX after oil change
  • Does Perrin AOS need maintenance
  • 2024 WRX rough idle cold start common issues
  • P0420 catalyst efficiency after AOS install
  • Best oil catch can for 2022+ WRX

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandPerrin Performance
Part NumberPSP-ENG-622
CategoryAir and Fuel
5,000+ Trusted brands
1M+ Enthusiasts
5M+ Parts sold
(760) 282-4645 hello@motormia.co

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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