Perrin PSP-ENG-622RD Air Oil Separator Textured Red 2022-2026 Subaru WRX FA24

Vehicle Fitment

• 2022-2026 Subaru WRX (2.4L FA24DIT H4 Turbocharged, AWD)

Fitment Notes

• Designed exclusively for the 2022-2026 Subaru WRX with the FA24DIT engine - does not fit 2002-2021 WRX or any STI model (see PSP-ENG-620RD for EJ-engine applications).
• Does not fit 2022+ WRX STI - no WRX STI was produced for the 2022+ generation.
• Compatible with stock and aftermarket intercooler setups.
• Installation mounts to existing OEM locations using provided hardware - no drilling or permanent modifications required.
• Also available in Black (PSP-ENG-622BK).
• Installation typically takes 1-2 hours with basic hand tools.

Features

• Separates oil vapor from crankcase blow-by before it re-enters the intake system, preventing carbon buildup on intake valves, intercooler, and intake tract
• CNC-machined aluminum construction with textured red powder coat finish for corrosion resistance and long service life
• Internal baffle design provides efficient multi-stage oil vapor separation
• Purpose-built fittings engineered specifically for the FA24DIT engine's crankcase vent locations - no T-connections required
• Serviceable drain valve allows quick oil removal during routine maintenance intervals
• Unlike a catch can, the AOS automatically returns separated oil back to the engine - no manual draining required
• Maintains cleaner combustion, reduces knock potential, and extends engine life
• No ECU recalibration or tune required

Specifications

• Part Number: PSP-ENG-622RD
• Color: Textured Red powder coat
• Material: CNC-machined aluminum
• Engine Compatibility: Subaru FA24DIT (2022-2026 WRX)
• Drain Type: Petcock drain valve - automatically returns oil to engine
• Tune Required: No
• Estimated Install Time: 1-2 hours
• Maintenance Interval: Drain every 3,000-5,000 miles or at each oil change
• Warranty: 5-year Perrin limited warranty
• Made in USA
• Brand: Perrin Performance

Included Components

• 1x Perrin Air Oil Separator Assembly - Textured Red
• 1x CNC-machined crankcase vent fitting set
• 1x Drain valve
• 1x Mounting hardware kit
• 1x Installation instructions

Product Description

The Perrin PSP-ENG-622RD Air Oil Separator is the textured red variant of Perrin's precision-engineered engine protection upgrade for the 2022-2026 Subaru WRX FA24DIT engine. The FA24's crankcase ventilation system recirculates blow-by gases back into the intake - a process that gradually deposits oil vapor on the intake valves, intercooler core, and intake tract, leading to power loss and premature valve wear over time. The Perrin AOS intercepts this process, separating oil vapor from air and automatically draining it back into the engine without any manual intervention - a far more practical long-term solution than a traditional catch can.

The CNC-machined aluminum body features purpose-built fittings engineered specifically for the FA24's crankcase vent locations, ensuring a clean installation with no T-connections needed. The serviceable design includes an accessible drain valve for routine maintenance, and no tune or ECU recalibration is required. Also available in Black (PSP-ENG-622BK). Backed by Perrin's 5-year limited warranty and made in the USA.