Description
The PERRIN Air Oil Separator (AOS) for the 2022-2026 Subaru WRX is engineered to improve engine longevity and performance by removing oil vapors from crankcase blow-by before they reach the intake system. Designed specifically for the FA24 turbocharged engine platform, this system helps reduce carbon buildup, protect intake components, and maintain consistent engine efficiency.
Unlike traditional catch cans that require frequent draining, the PERRIN AOS uses an advanced internal separation system that captures oil particles and returns them safely back to the engine. This ensures continuous operation without routine maintenance while maintaining clean airflow into the intake manifold.
The system utilizes dual internal airflow separation methods, combining a swirling vortex effect with engineered internal impact surfaces to efficiently remove oil from air and vapor mixtures. This reduces oil contamination in the intake tract, intercooler, and combustion chamber.
A key advantage of the PERRIN AOS is its coolant-heated design, which stabilizes internal temperatures to minimize condensation and sludge formation. This thermal management system ensures optimal separation of oil, air, and water vapor even under varying driving conditions.
Constructed from CNC-machined 6061-T6 aluminum and finished with a durable ceramic coating rated over 500°F, the system provides long-term resistance to heat, chemicals, and physical wear. Aluminum fittings and stainless-steel clamps ensure durability and secure installation.
The optimized mounting design allows proper placement in the engine bay while maintaining clearance from aftermarket components such as intercoolers, charge pipes, and intake systems.
FITMENT:
2022-2026 Subaru WRX (All trims including Base, Premium, Limited, GT, TR, TS, Series.Yellow)
Key Features:
Removes oil vapors from crankcase gases
Reduces carbon buildup on intake valves
Improves long-term engine health and efficiency
Advanced dual-stage oil separation system
Coolant-heated body to prevent condensation
Returns separated oil back to engine
No routine draining required (maintenance-free design)
CNC-machined 6061-T6 aluminum construction
Ceramic-coated heat and chemical resistant finish
Stainless steel clamps and aluminum fittings
Optimized engine bay placement for 2022+ WRX
Specifications:
Application: Subaru WRX (2022–2026)
Engine: FA24 turbocharged engine
Material: CNC-machined 6061-T6 aluminum
Finish: High-temp ceramic coating (>500°F rated)
System Type: Air Oil Separator (closed-loop oil return)
Installation: Direct-fit bolt-on system
