Killer B Catch Can/AOS | 2022 Subaru BRZ/Toyota GR8622BRAOS 2022 Subaru BRZ Toyota GR86 Catch Can AOS by Killer B The Killer B Motorsport Dual Catch Can AOS system is designed to remove excess oil vapor from crankcase gasses before they reach your intake. Doing so keeps your intake and valves cleaner and maintains proper octane levels. We do this using an efficient vortex system without limiting flow rates, unlike baffled units. Our Street Single AOS configuration places the AOS behind the intake