Product Description
Fitment Information:
2004-2021 Subaru STI
2006-2007 Subaru WRX (08-14 WRX can work if updated to the STi intake manifold)
2004-2008 Subaru Forester XT
Note: This item works with a lot of of other vehicles with EJ25 engine swaps that utilize the OEM STi or WRX aluminum intake manifolds.
Features:
The I Build Race Cars Air Oil Separator kit is a triple pass system with carefully designed diameters and cross sections to effectively remove a range of oil droplet sizes. This AOS installs directly above the main crank case vent between the intake manifold and the TMIC. Installing here allows a clean look and the shortest possible hose routing. Since this is a true AOS the oil drains back into the block and never needs to be emptied. Small ridges on the faces of the spiral baffles collect the oil and allows the oil to stay out of the laminar airflow and effectively drain down to base of the system. The internals can be cleaned periodically by disassembling the unit with the tool-free thumb screw on top.
Throttle Body Type: Drive by Wire
Never needs to be emptied
Short hose routings for a very clean install
Carbon fiber outer housing tube for a high performance look and feel
Retains factory PCV functionality
Triple pass system for the most effective droplet separation
Tool free and easy to clean assembly
Included in this Kit:
AOS01 Assembly
AOS01 Mounting Bracket
All Required Hoses and Hose Clamps for the installation
Usually ships same or next day. 
