Cobb 06-07 Subaru WRX / 04-07 STi Air Oil Separator

This kit from Cobb includes everything you need to install their Air Oil Separator (AOS) on your 2006-2007 Subaru WRX or 2004-2007 Subaru STi. The AOS is designed to help reduce the amount of oil vapor that gets into your engine's intake system. Over time, especially in performance-oriented turbocharged Subarus, oil can get pushed into the intake tract from the crankcase ventilation system. This oil can then contaminate your intercooler, charge piping, and even the combustion chambers, potentially leading to reduced performance and increased carbon buildup.

Cobb's AOS works by separating the oil from the crankcase vapors before they re-enter the intake. The separated oil is then routed back into the oil pan, keeping your intake system cleaner. This is particularly beneficial for vehicles that see spirited driving or track use, where higher crankcase pressures can exacerbate oil blow-by. The kit is designed as a direct fit, meaning it uses factory mounting points and connections wherever possible, simplifying the installation process. The components are well-built to handle the demands of the engine bay.

Proper installation of this AOS is key to its effectiveness. It's recommended to consult the manufacturer's installation instructions for detailed guidance on routing lines and securing components. By keeping oil out of your intake, you can help maintain consistent engine performance and potentially reduce the need for more frequent cleaning of intake components.