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The Crawford Performance Air Oil Separator (AOS) is the original solution to Subaru's notorious oiling system issues. Although the technology was pre-existing with other vehicle brands such as Porsche, Crawford Performance is the inventor of the first system specifically for Subaru. No other AOS on the market employs the same technology. New Baja Edition Features: Labyrinth within Baffled Chambers increase efficiency Does not delete Smog Component - Utilizes OEM PCV System 2 Lines = 10 minute Install! Tested on the Subaru-Backed Crosstrek Desert Racer for thousands of race miles