GrimmSpeed Black Air / Oil Separator Subaru WRX 02-07 / STI 04-21 / Forester XT 04-08 | 078006 vendor_NGK Plugs better handling

better handling

Part #: 502-880-3145BK

Part #: COP-542

Red LED Footwell Kit

GrimmSpeed Black Air / Oil Separator Subaru WRX 02-07 / STI 04-21 / Forester XT 04-08 | 078006 vendor_NGK Plugs better handlingFitment Information: 2002 2007 Subaru WRX 2004 2021 Subaru STI 2004 2008 Subaru Forester XT Features: An Air Oil Separator has one job: remove the oil from the engine ventilation system so that the oil doesn't get sent through the intake system. When there is oil in your system, it results in reduced fuel octane, higher chance of engine knock (detonation), worse emissions, and higher oil consumption. The GrimmSpeed Air Oil Separator has a unique