Improve your Subaru’s engine performance and reliability with the GrimmSpeed Air Oil Separator, designed for WRX (2008-2014), Legacy GT (2005-2009), Forester XT (2009-2013), and Outback XT (2005-2009) models. This premium Air/Oil Separator efficiently removes oil vapor from the crankcase ventilation system, preventing oil buildup in the intake and reducing engine knock and oil consumption.

Crafted from fully machined billet aluminum with a durable anodized black finish, the GrimmSpeed AOS offers both strength and a clean, professional engine bay look. Its maintenance-free design requires no mesh media or draining, while user-replaceable O-ring seals ensure long-term durability. The unit retains the factory PCV valve for straightforward, hassle-free installation, making it an ideal upgrade for Subaru enthusiasts focused on improving engine efficiency and emissions.

Perfect for Subaru owners seeking a reliable, high-quality solution to keep their engines running clean and smooth, this Air Oil Separator is a trusted performance upgrade. Enhance your Subaru’s longevity and performance—upgrade today with this essential part from Subimods.