Part Number: PSP-ENG-620

Description: Air Oil Separator

Color: Available Black or Red

Fitment: 02-07 Subaru WRX & STI

Details:

Its back, and better than ever 🔥
The PERRIN Air Oil Separator has been updated with improved design and fitment while delivering the same trusted protection for your engine. By separating oil from crankcase vapors before they reach the intake, the PERRIN AOS helps:

• Reduce carbon buildup
• Improve intercooler efficiency
• Maintain engine performance

Plus, the closed-loop system returns oil back to the engine, so there’s no catch can to constantly drain.

Optional AOS Mounting Location

The PERRIN Air Oil Separator FMIC Mounting Bracket mounts your AOS at the pitch stop location, positioning it in the center of the engine bay. This placement is ideal for vehicles equipped with a front mount intercooler that require an alternative AOS mounting solution.