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GrimmSpeed (AOS) Air/Oil Separator - 02-07 Impreza WRX, 04-14 Impreza WRX STI, and 15+ WRX STI

GrimmSpeed Air Oil Seperator 02+ Subaru WRX STi

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Availability:- Ready to Ship

Usually Ships From: East Coast
Product Code: GRM.078006

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The Grimmspeed AOS (Air Oil Seperator) is a compact upgrade that does the job of combating the factory's blow-by problem; this is a common problem in Subaru EJ25 motors and can cause the dreaded ring land issue.

Most systems implement a complex and cumbersome system with an actual oil catch tank, the Grimmspeed system is a much simpler inline kit that replaces the oil cap*. This kit basically keeps oil away from the engine's ventilation system, this way you'll have a cleaner air intake system without oil going through it.

As a result, you will experience the following:
  1. Consistent oil octane
  2. Reduced chances of engine knock (detonation)
  3. Reduced oil consumption
  4. Cleaner emissions and MPG

  • Subaru Impreza WRX [GD/GG] (2002, 2003, 2004, 2005, 2006, 2007)
  • Subaru Impreza WRX STi [GDB] (2004, 2005, 2006, 2007
  • Subaru Impreza WRX STi [GRB/GVB] (2008, 2009, 2010, 2011, 2012, 2013, 2014)
  • Subaru WRX STI [VAB] (2015, 2016, 2017, 2018)
*Recommended for OEM, Stage 1, or Stage 2 builds. For Stage 3 and High Horse power builds a AOS with catch tank is recommended
  • Compact system
  • Helps ensure engine longevity
  • Ideal for OEM, Stage 1, and Stage 2 builds
  • Available in 3 finishes
  • Made of Anodized Aluminum for looks and endurance
  • A must have for all EJ25 Turbo Motors

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