Verus Engineering Air Oil Separator Kit - 2015-2021 Subaru STI

The Verus Engineering Air Oil Separator (AOS) guarantees that the intake system remains completely free from oil. Oil presence in the intake system can diminish the octane rating, potentially resulting in detonation, power reduction, and the accumulation of carbon deposits. Installing the AOS is a breeze as it functions like an original equipment (OE) component, requiring no modifications or adjustments to the existing tune or setup. What sets the Verus AOS apart is its ability to filter both the crankcase vent and intake filter locations through a single unit. With four 5-micron coalescent filters, one on each inlet and outlet, along with baffling and stainless mesh, the AOS offers unparalleled air filtration for the crankcase air. In regions with colder climates, an optional coolant hook-up kit is available. This kit allows the AOS to be connected to the hot coolant system, effectively minimizing condensation buildup during colder months. Verus Engineering Air Oil Separator Ki