GrimmSpeed Air/Oil Separator Kit 4-21 Subaru STI 02-07 WRX remove the oil from the engine ventilation system so the oil does not get sent through the intake system.
 
The GrimmSpeed Air/Oil Separator for turbocharged Subaru models has a unique design that allows you to maintain your PCV Valve while separating the oil out of the crankcase and head ventilation air! Our AOS will allow your engine to run more efficiently due to the separation of oil from the intake system. When there is oil in your system, the result is:
Reduced fuel octane
Higher chance of engine knock (detonation)
Worse emissions
Higher oil consumption.
 
Contents:
(1) AOS Unit
(3) AOS Hose Fittings
(2) 1/2" to 1/2" Hose Connector
(1) 1/2" Cap
(1) 8.5ft of 1/2" Fuel Hose
(8) Zip Ties
 
FITMENTS:
2004-21 Subaru STI
2002-07 Subaru WRX
2004-08 Subaru Forester XT
2004-06 Subaru Baja XT
 
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