GrimmSpeed Air Oil Separator Black 2008-2014 WRX / 2005-2009 Legacy GT / 2009-2013 Forester XT / 2005-2009 Outback XT

The GrimmSpeed Air/Oil Separator is engineered to remove oil from your engine’s crankcase and head ventilation system, keeping it out of the intake and improving engine efficiency. By separating oil from the ventilation air, the AOS helps prevent:

• Reduced fuel octane
• Engine knock (detonation)
• Poor emissions
• Excessive oil consumption

Features:

• Maintenance-Free Design: No mesh media or catch can draining required
• Fully Machined Billet aluminum construction for durability and precision
• Anodized Finish for a sleek engine bay look
• User-Replaceable O-Ring Seals for long-term reliability
• Retains Factory PCV Valve for hassle-free installation

FITMENTS:

• 2008-2014 Subaru WRX
• 2005-2009 Subaru Legacy GT
• 2005-2009 Subaru Outback XT
• 2009-2013 Subaru Forester XT

Installation Instructions