Perrin [02-07 WRX, 04-07 STI] Air Oil Separator - Neon Yellow | PSP-ENG-605NY Speedzone Performance LLC Waterproof Rating: Fully sealed against

Waterproof Rating: Fully sealed against moisture intrusion

You'll need band clamps or worm-drive clamps sized for 3

Black housing - Matches modern Cascadia aesthetics without paint prep

or construction areas (replace more often)

Perrin [02-07 WRX, 04-07 STI] Air Oil Separator - Neon Yellow | PSP-ENG-605NY Speedzone Performance LLC Waterproof Rating: Fully sealed againstThe 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