Perrin Air Oil Separator Red Subaru WRX / STI 2002-2021 | PSP-ENG-620RD

Product Fitment:

2002-2021 Subaru WRX

2004-2021 Subaru STI

The PERRIN Performance Air Oil Separator (AOS) is a premium engine protection system designed specifically for 2002-2021 Subaru WRX and 2004-2021 STI models. This red-anodized aluminum separator prevents oil vapor contamination in your intake system, reducing carbon buildup and maintaining optimal engine performance for turbocharged Subaru engines.

Key Features & Benefits

• Advanced Oil Separation Technology - Removes oil vapor from crankcase ventilation before it enters the intake system, preventing carbon deposits on intake valves
• CNC-Machined Aluminum Construction - Durable 6061-T6 aluminum body with signature PERRIN red anodizing for corrosion resistance and heat dissipation
• Direct Bolt-On Installation - Engineered for perfect fitment with OEM-quality mounting brackets and hardware included
• Internal Baffle System - Multi-stage separation process ensures maximum oil vapor removal efficiency
• Serviceable Design - Easy-access drain valve and removable top for maintenance and cleaning
• Performance Enhancement - Maintains cleaner combustion, reduces knock potential, and extends engine life

What's Included

• PERRIN Air Oil Separator assembly (red anodized)
• Mounting brackets and hardware
• High-temperature silicone hoses
• Stainless steel clamps
• Installation instructions

Installation

Direct bolt-on installation typically takes 2-3 hours with basic hand tools. The separator mounts in the engine bay using provided brackets and connects to the crankcase ventilation system via the included hoses. Professional installation recommended for optimal results. Regular maintenance involves draining collected oil through the petcock valve every 3,000-5,000 miles depending on driving conditions.