Back Sign In

SET YOUR CAR

Shop By Category --->

Engine

Suspension

Set Your Car

Product images

Product Media

Engine
Oil Systems
Air Oil Separators >Radium AOS-R Kit - Subaru Models (inc. 2002-2007 WRX / STI / 2004-2008 Forester XT)

Radium AOS-R Kit

Subaru Models (inc. 2002-2007 WRX / STI / 2004-2008 Forester XT)

Product Resources

Fitment Details

Features & Product Details

RallySport Direct carries highly engineered products designed to improve the performance and longevity of your vehicle brought to you by Radium Engineering.

This is the Radium Engineering Air Oil Separator R Kit. In high-powered and modified Subaru engines, they tend to create excessive blow-by with oil vapors and gasses. in these cases, a regular small catch can fill up quickly with oil and not be adequate. The AOS R kit will keep blow-by oil and other pollutants out of the intake pipe, intake manifold, turbocharger, and intercooler during all engine loads. The main difference is that the AOS R system returns what is collected into the oil pan, so no servicing is required. The built-in heater keeps water from condensing in the AOS, and because water is denser than oil, there is an integrated water trap found around the bottom perimeter of the can. This overall design prevents water from descending into the oil pan if ever present. Additionally, because the water is trapped against the heater, it will eventually boil and evaporate out of the system.

HIGHLIGHTS:

The AOS is constructed of (3) CNC-machined sections that screw together and are sealed with O-rings

Prevents oil buildup in the intake or intercooler system walls, throttle body, and intake manifold

Lowers hydrocarbon emissions

Effectively raises the octane and increases engine performance with cleaner inlet air

Height: 6.3" without fittings

Diameter: 3.45" round

Capacity: 20.3 oz (600mL)

INCLUDES:

Machined aluminum Radium Engineering Air Oil Separator

Subaru-specific designed mounting bracket

All necessary SAE J30R7-rated PCV/emissions hose

Coolant hoses and fittings

All necessary aluminum fittings and hose-ends

Stainless steel mounting hardware

NOTES:

For 02-05 models, Subaru equipped with a cable-actuated throttle body, you will need the Radium Engineering Cruise Control Relocation Bracket (sold separately)

If operated in freezing environments, Radium Engineering recommends installing insulation sleeving (not included) over any hose exposed to cold air flow - This will help prevent any water condensation from freezing and potentially clogging the hose

For RHD vehicles, Radium's Universal AOS-R must be used for custom mounting and plumbing

The Radium AOS-R kit may not be compatible with all other aftermarket products