Moroso Air Oil Separator Subaru STI 2008-2014 50 and a proprietary outer CV

and a proprietary outer CV with a larger spline

30 degree drop in oil temperatures

Gauge face is smoked out when off

all applicable bearings

Moroso Air Oil Separator Subaru STI 2008-2014 50 and a proprietary outer CVPart: # 85510 From the factory excess crankcase vapors, residual oil and moisture are vented back into the intake manifold and crankcase ventilation system. This can coat the pistons and everything else with a detonation prone layer of oil. This is no good in a turbocharged vehicle. Moroso has come up with a 2 tank system that allows the factory crankcase ventilation to operate how it was designed. No other system on the market does this. Billet