Perrin [02-07 WRX, 04-07 STI] Air Oil Separator - Neon Yellow | PSP-ENG-605NY Speedzone Performance LLC You'll need band clamps or

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

Reinforced silicone bend hose designed to route coolant

OEM-spec core design - Maintains thermal efficiency under continuous operation and heavy payload

Waterproof Rating: Fully sealed against moisture intrusion

or construction areas (replace more often)

Perrin [02-07 WRX, 04-07 STI] Air Oil Separator - Neon Yellow | PSP-ENG-605NY Speedzone Performance LLC You'll need band clamps orThe 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