The APR Oil Catch Can System replaces the failure prone factory positive crank ventilation (PCV) system and traps excessive crankcase oil vapors and gunk from entering the engine. The system eliminates a common performance robbing boost leak, while reducing carbon buildup on intake valves, octane lowering oil vapors and oil pooling within the intake tract. It’s a simple modification to install, drains in seconds with the flick of a knob, and is recommended at all stages of performance.