Air Oil Separator (AOS) - Subaru STI (GR/GV)

Overview

This air oil separator for the GR/GV Subaru STI keeps oil vapor out of the intake, where it would lower octane and lead to detonation, lost power and carbon build-up. It replaces both the crankcase vent and intake filter breather connections with one unit and installs like an OE part, so no tune or setup change is required.

Four 5 micron coalescing filters, placed at every inlet and outlet, work with baffling and stainless mesh to clean the crankcase air. A coolant hook-up kit is available separately to circulate hot coolant through the unit and limit condensation in cold months. The anodized finish can fade over time from engine bay heat.

What's included

• Assembled AOS
• 4 Coalescent Filters
• Internal Baffling
• Stainless Mesh
• Sheet Steel Bracket for GR/GV Chassis, LHD Only
• 3/4" Rubber Hose
• 1/2" Rubber Hose
• 3/8" Rubber Hose
• Hardware Bag, Including All Necessary Parts for a Seamless Install

Fitment

• 2008–2014 Subaru WRX
• 2008–2014 Subaru WRX STI

Options

• Color: Black, Blue, Red

Details

• Manufacturer: Verus Engineering
• Part number: A0259A
• Shipping weight: 4 lb

Installation instructions are available in the Verus Engineering install manual library.