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Grimmspeed Air Oil Separator 02-14 WRX / 04-20 STI IAG Performance Competition Series Air Oil Separator 02-07 WRX / 04-07 STI Crawford Air Oil Separator 02-07 WRX / 04-07 STI
. Made in the USA and our favorite AOS on the market! No Warranty on Crawford AOS's.
IAG Performance Street Series Air Oil Separator 06-07 WRX / 04-07 STI Radium Engineering Dual Catch Can Kit 02-07 WRX / 04-07 STI Radium Engineering AOS Kit 02-07 WRX / 04-07 STI
Made in the USA and our favorite AOS on the market! Our favorite catch can! Insurance For Your Engine
Perrin Air Oil Separator 02-14 WRX / 04-17 STI
Available for both FMIC and TMIC Setup.