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Perrin [02-07 WRX, 04-07 STI] Air Oil Separator - Neon Yellow | PSP-ENG-605NY Sparco Will this interfere with aThe 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
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