Perrin [02-07 WRX, 04-07 STI] Air Oil Separator - Neon Yellow | PSP-ENG-605NY DND Performance Interior(R) the rail’s internal geometry maintains

the rail’s internal geometry maintains laminar flow to every injector

Rubber O-Ring Gaskets

Core Size (without fans): 24" x 9

Please verify local laws regarding exhaust system modifications before installation

Upgrade your vehicle with this easy-to-install front lip for enhanced performance and style

Perrin [02-07 WRX, 04-07 STI] Air Oil Separator - Neon Yellow | PSP-ENG-605NY DND Performance Interior(R) the rail’s internal geometry maintainsThe AOS increases intercooler efficiency by reducing the amount of oil deposited into your intercooler and intake system! As blow by oil builds up inside your intercooler, the less efficient it becomes due to less heat being transferred away from your engine. This leads to power loss and detonation, which can be damaging to your engine. Reduce carbon build up in the combustion chamber, intake valves, and in your intake tract. Crank case blow by is