Uploaded July 2026 | Updated September 2026, 33 minutes ago
Is the Perrin Air Oil Separator (AOS) one of the best reliability mods for the 2022-2026 Subaru WRX? In this video, I'll show you how to install the Perrin Performance Air Oil Separator on the FA24-powered VB WRX from start to finish. I'll walk you through every step of the installation, explain how an AOS works, and discuss whether it's worth adding to your Subaru.
The FA24 engine can experience oil blow-by under boost, allowing oil vapor to enter the intake system. An Air Oil Separator helps capture that oil before it reaches your intercooler and intake, helping keep the intake tract cleaner over time. If you're planning future performance upgrades or simply want to protect your engine, this is one of the most popular reliability modifications for the 2022-2026 WRX.
Whether you're new to working on your Subaru or an experienced DIY enthusiast, this installation guide will help you complete the job with confidence.
In this video:
✔ Complete Perrin AOS installation
✔ Required tools and installation tips
✔ How an Air Oil Separator works
✔ Benefits of reducing oil blow-by
✔ Is the Perrin AOS worth the money?
✔ Final thoughts after the install
If you enjoyed this video, don't forget to Like, Subscribe, and turn on notifications for more WRX installs, reviews, and performance upgrades!
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STI S209 Brandon Semenuk ride along youtube.com/watch?v=cm3ivwAACZc
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00:00 Introduction
00:45 Why Install an Air Oil Separator?
02:30 Tools You'll Need
03:15 Removing Factory Components
08:40 Installing the Perrin AOS
17:20 Hose Routing & Final Assembly
22:10 First Startup & Inspection
24:15 Is the Perrin AOS Worth It?
26:00 Final Thoughts
Is the Perrin Air Oil Separator (AOS) one of the best reliability mods for the 2022-2026 Subaru WRX? In this video, I'll show you how to install the Perrin Performance Air Oil Separator on the FA24-powered VB WRX from start to finish. I'll walk you through every step of the installation, explain how an AOS works, and discuss whether it's worth adding to your Subaru.
The FA24 engine can experience oil blow-by under boost, allowing oil vapor to enter the intake system. An Air Oil Separator helps capture that oil before it reaches your intercooler and intake, helping keep the intake tract cleaner over time. If you're planning future performance upgrades or simply want to protect your engine, this is one of the most popular reliability modifications for the 2022-2026 WRX.
Whether you're new to working on your Subaru or an experienced DIY enthusiast, this installation guide will help you complete the job with confidence.
In this video:
✔ Complete Perrin AOS installation
✔ Required tools and installation tips
✔ How an Air Oil Separator works
✔ Benefits of reducing oil blow-by
✔ Is the Perrin AOS worth the money?
✔ Final thoughts after the install
If you enjoyed this video, don't forget to Like, Subscribe, and turn on notifications for more WRX installs, reviews, and performance upgrades!
Garage tools I use
Milwaukee impact wrench amzn.to/3rxgmEt
QuickJacks 5000 lift system amzn.to/3kg39yk
Torque wrench amzn.to/3FcHmmh
Mechanics Tool Set Get amzn.to/4dqajYp
Dremel amzn.to/4rvHDTb
Sparco Sweatshirt amzn.to/3mhxm1D
perrin.com/products/air-oil-separator-for-2022-2026-wrx?_pos=1&_sid=b5c344b48&_ss=r
🎥 My Filming Gear
📷 Camera Body amzn.to/4q6hydR
📸 Vlog Lens amzn.to/45s7xyp
📸 Zoom lens amzn.to/4rqzVda
🎤 Audio amzn.to/3LlZqNH
🎥 Gimbal amzn.to/3l5CkO6
💻 Video editing computer amzn.to/3PfWHa9
💻 Editing Laptop amzn.to/45soiIS
👉🏼Music I use in my YouTube videos (Epidemic Sound), sign up for a 30-day free trial here epidemicsound.com/referral/yip2yn
More JDM RHD
Follow me on Instagram instagram.com/jdmrighthanddrive
Facebookfacebook.com/joshua.fenske.77
More JDM RHD 2022 WRX Content
STI S209 Brandon Semenuk ride along youtube.com/watch?v=cm3ivwAACZc
VB WRX STI brake kit youtube.com/watch?v=w1A1c2GGDnM
All clickable links in description help to support my channel via affiliate commissions paid by sellers. Thanks for your support.
00:00 Introduction
00:45 Why Install an Air Oil Separator?
02:30 Tools You'll Need
03:15 Removing Factory Components
08:40 Installing the Perrin AOS
17:20 Hose Routing & Final Assembly
22:10 First Startup & Inspection
24:15 Is the Perrin AOS Worth It?
26:00 Final Thoughts
