COMPATIBILITY
12-16 Scion FR-S (LHD)
12-21 Toyota GT86 (LHD)
12-20 Subaru BRZ (LHD)

High-powered modified Toyota 4U-GSE and Subaru FA engines tend to generate excessive blow-by oil and gasses. In these cases, an ordinary small catch can may quickly fill with oil and not be adequate. Like the Radium Engineering Dual Catch Can Kit, the AOS-R (Air Oil Separator-Return) kit is responsible for keeping blow-by oil and other pollutants out of the intake pipe, manifold, turbocharger, and intercooler during all engine loads. The main difference is that an AOS-R system returns what is collected back into the oil pan (as shown below) so there is no servicing required. The built-in heater keeps water from condensing in the AOS-R. And because water is more dense than oil, there is an integrated water trap found around the bottom perimeter of the can.

DIMENSIONS
AOS-R Height: 6.3" (without fittings)
AOS-R Diameter: 3.45" Round 
AOS-R Capacity: 20.3 oz (600mL)

PORTS
Inlet: 7/8"-14 threaded for 10AN ORB fittings
Outlet: 7/8"-14 threaded for 10AN ORB fittings
Return: 7/8"-14 threaded for 10AN ORB fittings
Coolant: 7/16"-20 threaded for 4AN ORB fittings (x2)

BENEFITS
-Effectively raises the octane and increases engine performance with cleaner inlet air 
-Prevents oil buildup in the intake or intercooler system walls, throttle body, intake manifold, etc.
-Lowers hydrocarbon emissions

NCLUDED
-Machined alumium Radium Air Oil Separator
-Specially designed mounting bracket
-SAE J30R7 rated PCV/Emissions hose
-Coolant heater hoses and fittings
-All necessary aluminum fittings and hose-ends
-Stainless steel mounting hardware 

Instruction PDF