Radium Aos-R Catch can Kit Subaru 09-13 Xt 08-14 Wrx, 15-21 Sti

High-powered modified Subaru 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 Subaru Dual Catch Can Kit, the AOS (Air Oil Separator) 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 so there is no servicing required. The built-in heater keeps water from condensing in the AOS. And because water is more dense than oil, there is an integrated water trap found around the bottom perimeter of the can
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09-13 Subaru Forester XT
08-14 Subaru Impreza WRX
08-14 Subaru Impreza WRX STi
15-21 Subaru WRX STi

NOTE: For 2015+ Subaru Forester XT/WRX (non STi) go HERE.