Killer B

Killer B Motorsport Air Oil Separator

2008-2014 Subaru WRX / 2015-2021 STI / 2005-2009 Legacy GT

Ships for free in the 48 states

SKU: GR-MV3S-CWe price match!

Only 1 left!
Ships today if ordered in
13 hrs 24 mins

Killer B Motorsport Air Oil Separator Complete Kit Subaru STI 2008+ / Subaru WRX 2008-2014
You will earn Reward Points with this Purchase.


Killer B Motorsport Air Oil Separator Complete Kit 2008-2014 Subaru WRX 2008+ Subaru STI


  • Accelerated flow of blow-by gases forces suspended oil droplets out of suspension 
  • Centrifugal filtration is a proven process for separation for many particle types and sizes 
  • Collected oil drains back into the crankcase where it belongs
  • Applies vacuum to the crankcase improving ring seal, reducing oil consumption, and improving power potential
  • No media to clean/replaces baffles to inhibit crankcase flow
  • Billet 6061-T6 construction
  • TIG-welded
  • The Killer B Motorsport push-lock barb fittings require no hose clamps
  • Made in the USA



Air/oil separators are a common upgrade and modification for the Subaru EJ as harmful oil vapors like to make their way into the intake which can create many problems. This will coat the valves with oil and soot, your octane rating will be effective and you will have detonation issues as well. 

The Killer B Motorsport Air/Oil Separator is the result of years worth of engineering, along with research and development to remove oil in liquid and vapor form from the vented crankcase gases. This will prolong the performance and the life of your engine to reassure that your engine is performing at peak levels without worrying about the prevalent air/oil separation issues found in the Subaru crankcase ventilation system. 




People who viewed this item also viewed

0 customer reviews

Average rating
(based on 0 reviews)
Ease of Installation
Fit / Quality
Overall Satisfaction

Write Your Own Review

Only registered users can write reviews. Please, log in or register


No questions have been asked about this product.

Upload images for this product