Your WRX wasn’t built to inhale oil vapour—and with the PERRIN Air Oil Separator, it doesn’t have to. Designed specifically for the FA24 engine, this system keeps your intake clean, your combustion efficient, and your performance consistent whether you’re daily driving or pushing hard on boost.

What It Does

The PERRIN AOS captures and separates oil vapour from the crankcase ventilation system before it can re-enter the intake. The separated oil is safely returned to the engine, helping maintain optimal engine health without the maintenance of a traditional catch can.

Key Features

• Closed-Loop System ‐ Separates oil from air and recirculates it back into the engine, keeping the intake charge clean.
• Coolant-Heated Design ‐ Connects to the vehicle’s cooling system to prevent condensation build-up and freezing in colder conditions.
• Vehicle-Specific Fitment ‐ Engineered specifically for 2022‐2026 Subaru WRX models with precision brackets and hoses.
• Durable Construction ‐ High-quality aluminium components and reinforced hoses designed to withstand heat and pressure.
• Maintenance-Free Operation ‐ No need to empty or service like a traditional catch can system.

Why You Need It

Turbocharged engines are prone to oil blow-by, especially under higher boost levels. Over time, that oil can coat intercoolers, intake piping, and valves—reducing efficiency and performance. The PERRIN AOS stops this at the source, helping maintain power, reliability, and long-term engine health.

Ideal For

• Daily-driven WRXs looking for long-term engine protection
• Modified vehicles running increased boost
• Track and performance-focused builds requiring consistent reliability

Simple, effective, and built to last—the PERRIN Air Oil Separator is one of those upgrades that quietly does its job while your WRX performs at its best.

Package Contents:

• 1 × PERRIN Air Oil Separator
• 1 × Mounting Bracket
• 1 × Hardware for Installation
• 1 × Warranty & Instructions