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2011-2014 Subaru WRX and STI (w/TMIC) Perrin Air Oil Separater - Black
The PERRIN Performance Air Oil Separator traps oil from the crank case vents before it enters the intake, thus increasing intercooler efficiency and reduces chances of performance-robbing detonation. INCREASE INTERCOOLER EFFICIENCYThe AOS increases intercooler efficiency by reducing the amount of oi...
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