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Air and Fuel› Air Cleaners, Filters, Intakes and Components

GrimmSpeed

PCV Valve Catch Can Kit

$325.00 $315.00 Save $10.00

SKU: GRM078006

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In Stock
Ships by Aug 1
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30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

By separating oil from the crankcase and head ventilation air, the AOS helps maintain optimal engine performance, reduces the likelihood of detonation, and lowers oil consumption. Constructed from fully machined billet aluminum with a durable anodized finish, this AOS kit features user-replaceable O-ring seals for longevity. Its compact design ensures it fits efficiently within the engine bay. The GrimmSpeed Air/Oil Separator Kit is compatible with the following Subaru models: 2004-2021 STI, 2002-2007 WRX, 2004-2008 Forester XT, and 2004-2006 Baja XT.

MIA's Description

This kit allows the engine to run more efficiently by separating oil from the crankcase and head ventilation air, which can reduce fuel octane, increase the chance of engine knock, worsen emissions, and increase oil consumption.

Fitment

Fitment Guaranteed

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Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

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Specifications

BrandGrimmSpeed
Part NumberGRM078006
CategoryAir and Fuel

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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