Radium AOS-R Air Oil Separator Kit (02-2007 WRX/STI / 04-2008 Forester XT) Hi-Jet Fits all Koyorad radiators w/

Fits all Koyorad radiators w/ filler necks

A classy white base

Highly recommended to fit an IAT sensor

improving air oil separation

Sold As A Set Of 2

Radium AOS-R Air Oil Separator Kit (02-2007 WRX/STI / 04-2008 Forester XT) Hi-Jet Fits all Koyorad radiators w/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